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INSTRUCTION MANUAL

VHF MARINE TRANSCEIVER

This device complies with Part 15 of the FCC

Rules. Operation is subject to the condition that

this device does not cause harmful interference.

iM423

iM423G

iM424

iM424G

IC-M423G

FOREWORD

Thank you for choosing this Icom product. The IC-M423/IC-

M423G/IC-M424/IC-M424G

v h f m a r i n e t r a n s c e i v e r is de-

signed and built with Icom’s state of the art technology and

craftsmanship. With proper care, this product should provide

you with years of trouble-free operation.

Hope you agree with Icom’s philosophy of “technology ﬁrst.”

Many hours of research and development went into the de-

sign of your radio.

FEATURES D

❍ Simple operation with large keys

❍ Easy to hear speaker

❍ Built-in DSC meets ITU Class D requirement

❍ Rugged waterproof construction

❍ Optional COMMANDMIC

™ (HM-195)

❍ Easy to make an individual DSC calls using the

optional MA-500TR Class B AIS Transponder

❍ Built-in GPS

*For only IC-M423G and IC-M424G.

IMPORTANT

READ ALL INSTRUCTIONS carefully and completely

before using the transceiver.

SAVE THIS INSTRUCTION MANUAL — This in-

struction manual contains important operating instructions

for the transceiver.

EXPLICIT DEFINITIONS

WORD DEFINITION

RWARNING!

Personal injury, fire hazard or electric

shock may occur.

CAUTION

Equipment damage may occur.

NOTE

If disregarded, inconvenience only. No risk

of personal injury, ﬁre or electric shock.

CLEAN THE TRANSCEIVER AND MICROPHONE THOR-

OUGHLY WITH FRESH WATER after exposure to water

including salt, otherwise, the keys and switch may become

inoperable due to salt crystallization.

IN CASE OF EMERGENCY

If your vessel requires assistance, contact other vessels and

the Coast Guard by sending a Distress call on Channel 16.

Or, make your Distress call using digital selective calling on

Channel 70.

USING CHANNEL 16

DISTRESS CALL PROCEDURE

1. “MAYDAY MAYDAY MAYDAY.”

2. “THIS IS ...............” (name of vessel).

3. Say your call sign or other description of the vessel (AND

9 digit DSC ID if you have one).

4. “LOCATED AT ...............” (your position).

5. State the nature of the distress and assistance required.

6. Give any other information which might facilitate the res-

cue.

USING DIGITAL SELECTIVE CALLING (Ch 70)

DISTRESS CALL PROCEDURE

1. While lifting up the key cover, hold down [DISTRESS]

for 3 seconds until you hear 3 short beeps and then one

long beep.

2. Wait for an acknowledgment on Channel 70 from a coast

station.

 •Afterthe acknowledgement is received,Channel16 isauto-

matically selected.

3. Hold down [PTT], then transmit the appropriate informa-

tion as listed above.

COUNTRY CODE LIST

• ISO 3166-1

Country Codes Country Codes

1 Austria AT 18 Liechtenstein LI

2 Belgium BE 19 Lithuania LT

3 Bulgaria BG 20 Luxembourg LU

4 Croatia HR 21 Malta MT

5 Czech Republic CZ 22 Netherlands NL

6 Cyprus CY 23 Norway NO

7 Denmark DK 24 Poland PL

8 Estonia EE 25 Portugal PT

9 Finland FI 26 Romania RO

10 France FR 27 Slovakia SK

11 Germany DE 28 Slovenia SI

12 Greece GR 29 Spain ES

13 Hungary HU 30 Sweden SE

14 Iceland IS 31 Switzerland CH

15 Ireland IE 32 Turkey TR

16 Italy IT 3 3 United Kingdom GB

17 Latvia LV

Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incor-

porated (Japan) in Japan, the United States, the United Kingdom, Germany,

France, Spain, Russia, and/or other countries.

COMMANDMIC is a registered trademark of Icom Incorporated (Japan) in Ja-

pan and the United States.

iii

RADIO OPERATOR WARNING

WARNING

Icom requires the radio operator to meet the

FCC Requirements for Radio Frequency Expo-

sure. An omnidirectional antenna with gain not

greater than 9 dBi must be mounted a mini-

mum of 5 meters (measured from the lowest

point of the antenna) vertically above the main

deck and all possible personnel. This is the minimum safe

separation distance estimated to meet all RF exposure com-

pliance requirements. This 5 meter distance is based on the

FCC Safe Maximum Permissible Exposure (MPE) distance

of 3 meters added to the height of an adult (2 meters) and is

appropriate for all vessels.

For watercraft without suitable structures, the antenna must

be mounted so as to maintain a minimum of 1 meter verti-

cally between the antenna, (measured from the lowest point

of the antenna), to the heads of all persons AND all persons

must stay outside of the 3 meter MPE radius.

Do not transmit with radio and antenna when persons are

within the MPE radius of the antenna, unless such persons

(such as driver or radio operator) are shielded from antenna

ﬁeld by a grounded metallic barrier. The MPE Radius is the

minimum distance from the antenna axis that person should

maintain in order to avoid RF exposure higher than the al-

lowable MPE level set by FCC.

FAILURE TO OBSERVE THESE LIMITS MAY ALLOW

THOSE WITHIN THE MPE RADIUS TO EXPERIENCE RF

RADIATION ABSORPTION WHICH EXCEEDS THE FCC

MAXIMUM PERMISSIBLE EXPOSURE (MPE) LIMIT.

IT IS THE RESPONSIBILITY OF THE RADIO OPERATOR

TO ENSURE THAT THE MAXIMUM PERMISSIBLE EXPO-

SURE LIMITS ARE OBSERVED AT ALL TIMES DURING

RADIO TRANSMISSION. THE RADIO OPERATOR IS TO

ENSURE THAT NO BYSTANDERS COME WITHIN THE

RADIUS OF THE MAXIMUM PERMISSIBLE EXPOSURE

LIMITS.

Determining MPE Radius

THE MAXIMUM PERMISSIBLE EXPOSURE (MPE) RA-

DIUS HAS BEEN ESTIMATED TO BE A RADIUS OF

ABOUT 3M PER OET BULLETIN 65 OF THE FCC.

THIS ESTIMATE IS MADE ASSUMING THE MAXIMUM

POWER OF THE RADIO AND ANTENNAS WITH A MAXI-

MUM GAIN OF 9dBi ARE USED FOR A SHIP MOUNTED

SYSTEM.

AVERTISSEMENT POUR LES OPÉRATEURS RADIO

Icom exige que l'opérateur radio se conforme aux

exigences de la FCC en matière d'exposition aux

radiofréquences. Une antenne omnidirectionnelle

dont le gain ne dépasse pas 9dBi doit être ﬁxée

à une distance minimale de 5 mètres (mesurée

depuis le point le plus bas de l'antenne) verticale-

ment au-dessus du pont principal et de tout le personnel qui peut

s'y trouver. Il s'agit de la distance de sécurité minimale prévue pour

satisfaire aux exigences de conformité en matière d'exposition aux

RF. Cette distance de 5 mètres est établie en fonction de l'exposition

maximale admissible sécuritaire de 3 mètres établie par la FCC, à

laquelle on ajoute la hauteur d'un adulte (2 mètres); cette distance

convient pour tous les navires.

Dans le cas des embarcations sans structure convenable, l'antenne

doit être ﬁxée de façon à maintenir une distance minimale de 1 mètre

verticalement entre cette antenne (mesurée depuis son point le plus

bas) et la tête de toute personne présente; toutes les personnes

présentes doivent se tenir à l'extérieur d'un rayon d'exposition maxi-

male admissible de 3 mètres.

Ne pas émettre à l'aide de la radio et de l'antenne lorsque des

personnes se trouvent à l'intérieur du rayon d'exposition maximale

admissible de cette antenne, à moins que ces personnes (comme

le conducteur ou l'opérateur radio) ne soient protégées du champ

de l'antenne par un écran métallique relié à la masse. Le rayon

d'exposition maximale admissible équivaut à la distance minimale

que cette personne doit maintenir entre elle et l'axe de l'antenne pour

éviter une exposition aux RF supérieure au niveau d'exposition maxi-

male admissible ﬁxé par la FCC.

LE NON-RESPECT DE CES LIMITES PEUT CAUSER, POUR LES

PERSONNES SITUÉES DANS LE RAYON D'EXPOSITION MAXI-

MALE ADMISSIBLE, UNE ABSORPTION DE RAYONNEMENT DE

RF SUPÉRIEURE À L'EXPOSITION MAXIMALE ADMISSIBLE

FIXÉE PAR LA FCC.

L'OPÉRATEUR RADIO EST RESPONSABLE D'ASSURER QUE

LES LIMITES D'EXPOSITION MAXIMALE ADMISSIBLE SOIENT

RESPECTÉES EN TOUT TEMPS PENDANT LA TRANSMISSION

RADIO. L'OPÉRATEUR RADIO DOIT S'ASSURER QU'AUCUNE

PERSONNE PRÉSENTE NE SE SITUE À L'INTÉRIEUR DU RAY-

ON D'EXPOSITION MAXIMALE ADMISSIBLE.

Établir le rayon d'exposition maximale admissible

ON ESTIME QUE LE RAYON D'EXPOSITION MAXIMALE ADMIS-

SIBLE EST D'ENVIRON 3 M, TEL QUE STIPULÉ DANS LE BUL-

LETIN OET 65 DE LA FCC. CETTE DISTANCE ESTIMÉE TIENT

COMPTE D'UN SYSTÈME INSTALLÉ SUR UN NAVIRE UTILISANT

LA PUISSANCE MAXIMALE DE LA RADIO ET DES ANTENNES

DONT LE GAIN MAXIMAL EST DE 9dBi.

AVERTISSEMENT

New2001

FCC INFORMATION

• FOR CLASS A UNINTENTIONAL RADIATORS:

This equipment has been tested and found to comply with the

limits for a Class A digital device, pursuant to part 15 of the

FCC Rules. These limits are designed to provide reasonable

protection against harmful interference when the equipment

is operated in a commercial environment. This equipment

generates, uses, and can radiate radio frequency energy

and, if not installed and used in accordance with the instruc-

tion manual, may cause harmful interference to radio com-

munications.

Operation of this equipment in a residential area is likely to

cause harmful interference in which case the user will be re-

quired to correct the interference at his own expense.

• POUR LES RAYONNEMENTS NON INTENTIONNELS DE

CLASSE A:

Cet équipement a été testé et reconnu conforme aux limites ﬁxées

pour un appareil numérique de classe A, conformément au point

15 de la réglementation FCC. Ces limites sont déﬁnies de façon à

fournir une protection raisonnable contre le brouillage préjudiciable

lorsque cet appareil est utilisé dans un environnement commercial.

Cet équipement génère, utilise et peut émettre un rayonnement de

fréquence radio. S'il n'a pas été installé conformément aux instruc-

tions, il peut par ailleurs créer des interférences perturbant les com-

munications radio.

L'utilisation de cet appareil dans une zone résidentielle peut provo-

quer un brouillage préjudiciable, auquel cas l'utilisateur sera tenu de

corriger la situation à ses frais.

NOTE

A WARNING STICKER is supplied with the U.S.A. version

transceiver.

To comply with FCC regulations, this sticker must be afﬁxed in

such a location as to be readily seen from the operating con-

trols of the radio as in the diagram below. Make sure the chosen

location is clean and dry before applying the sticker.

EXAMPLE

WARNING.

New2001

PRECAUTIONS

RWARNING! NEVER

connect the transceiver to an AC

outlet. This may pose a ﬁre hazard or result in an electric shock.

RWARNING! NEVER connect the transceiver to a pow-

er source of more than 16 V DC such as a 24 V DC. This

could cause a ﬁre or damage the transceiver.

RWARNING! NEVER reverse the DC power cable po-

larity when connecting to a power source. This could damage

the transceiver.

RWARNING! NEVER cut the DC power cable between

the DC plug at the back of the transceiver and fuse holder. If

an incorrect connection is made after cutting, the transceiver

may be damaged.

CAUTION: NEVER

place the transceiver where normal

operation of the vessel may be hindered or where it could

cause bodily injury.

KEEP the transceiver and microphone at least 1 m away

from the vessel’s magnetic navigation compass.

DO NOT use or place the transceiver in areas with tem-

peratures below –20°C (–4°F) or above +60°C (+140°F) or, in

areas subject to direct sunlight, such as the dashboard.

DO NOT use harsh solvents such as benzine or alcohol to

clean the transceiver, as they will damage the transceiver’s

surfaces. If the transceiver becomes dusty or dirty, wipe it

clean with a soft, dry cloth.

DO NOT disassemble or modify the transceiver for any rea-

son.

BE CAREFUL! The transceiver rear panel will become

hot when operating continuously for long periods of time.

Place the transceiver in a secure place to avoid inadvertent

use by children.

BE CAREFUL! The transceiver and the optional HM-195

c o m m a n d m i c IV™ meet IPX7 requirements for waterproof

protection. However, once the transceiver has been dropped,

waterproof protection cannot be guaranteed because of pos-

sible damage to the transceiver’s case or the waterproof

seal.

* Except for the DC power connector, NMEA In/Out leads, and AF

Out leads.

For U.S.A. only

CAUTION: Changes or modiﬁcations to this device, not ex-

pressly approved by Icom Inc., could void your authority to

operate this device under FCC regulations.

vii

New2001

PRÉCAUTIONS

RAVERTISSEMENT! NE JAMAIS

connecter l’emetteur-

recepteur a une alimentation CA au risque de provoquer un in-

cendie ou un choc electrique.

AVERTISSEMENT!

NE JAMAIS

brancher l'émetteur-

récepteur à une source d'alimentation de plus de 16 V CC,

comme une source de 24 V CC. Cela pourrait causer un in-

cendie ou endommager l'émetteur-récepteur.

AVERTISSEMENT!

NE JAMAIS inverser la po-

larité du câble d'alimentation CC en le branchant à la source

d'alimentation. Cela pourrait endommager l'émetteur-récepteur.

AVERTISSEMENT!

NE JAMAIS

sectionner le câble

d'alimentation CC entre la prise CC de la face arrière de

l'émetteur-récepteur et le porte-fusible. L’émetteur-récepteur

peut être endommagé par la suite en cas de connexion inap-

propriée.

MISE EN GARDE:

NE JAMAIS

installer l’émetteur-

récepteur à un emplacement où il pourrait gêner le fonction-

nement normal du navire ou provoquer des blessures cor-

porelles.

MAINTENIR l'émetteur-récepteur et le microphone à au

moins 1 mètre du compas de route magnétique du navire.

NE PAS utiliser ou placer l’émetteur-récepteur dans des

zones où la temperature est inférieure à –20° (–4°F) ou

supérieure à +60° (+140°F) ou dans des zones soumises

au rayonnement solaire direct, telles le tableau de bord.

NE PAS nettoyer l'appareil avec des solvants agressifs tels

que benzène ou alcool, susceptibles d'endommager les sur-

faces exposées du boîtier. En cas de dépôt de poussière ou

de salissures sur l'émetteur-récepteur, il faut l'essuyer avec

chiffon doux et sec.

NE PAS démonter ou modiﬁer l'émetteur-récepteur pour

quelque raison que ce soit.

ATTENTION! La face arrière de l’émetteur-récepteur

chauffe en cas d’utilisation continue sur une longue durée.

Placer l’émetteur-récepteur hors de portée des enfants pour

éviter toute utilisation inopinée.

ATTENTION! L'émetteur-récepteur et l'accessoire option-

nel

c o m m a n d m i c IV

répondent aux exigences de l'indice

d'étanchéité IPX7

*. Cependant, cette etancheite n’est plus

garantie apres une chute de l’appareil en raison des ﬁssures

du boitier ou des dommages au joint d’etancheite et autres

dommages eventuels consecutifs a un tel incident.

* À l'exception du connecteur d'alimentation CC, des ﬁls d'entrée ou

de sortie NMEA et des ﬁls de sortie de fréquences audio.

viii

New2001

TABLE OF CONTENTS

FOREWORD .........................................................................i

IMPORTANT ..........................................................................i

EXPLICIT DEFINITIONS ....................................................... i

COUNTRY CODE LIST ........................................................ ii

IN CASE OF EMERGENCY ................................................. ii

RADIO OPERATOR WARNING .......................................... iii

AVERTISSEMENT POUR LES OPÉRATEURS RADIO ...... iv

FCC INFORMATION ............................................................v

NOTE .................................................................................... v

PRECAUTIONS ................................................................... vi

PRÉCAUTIONS .................................................................. vii

TABLE OF CONTENTS ......................................................viii

TABLE OF CONTENTS (continued) .................................... ix

1 OPERATING RULES .......................................................1

2 PANEL DESCRIPTION ....................................................2

Front panel ■ ...................................................................2

Function display ■ ...........................................................5

Softkey function ■ ............................................................7

Speaker Microphone ■ ....................................................8

3 PREPARATION................................................................9

Entering the MMSI code ■ ..............................................9

Entering the ATIS code ■

(For Dutch and German version transceivers) ...........10

4 BASIC OPERATION ......................................................11

Selecting a Channel ■ ...................................................11

Receiving and transmitting ■ .........................................14

Adjusting the ■ volume and squelch levels ...................15

Entering a Call channel data ■ ......................................16

Entering a Channel name ■ ..........................................16

Microphone Lock function ■ ..........................................17

Adjusting the Backlight level ■ .......................................18

Using the AquaQuake water draining function ■ ...........18

5 SCAN OPERATION .......................................................19

Scan types ■ .................................................................19

Setting Favorite channels ■ ...........................................20

Starting a scan ■ ...........................................................20

6 DUALWATCH/TRI-WATCH ............................................21

Description ■ .................................................................21

Operation ■ ...................................................................21

7 DSC OPERATION .........................................................22

DSC address ID ■ ........................................................22

Entering position and time ■ .........................................25

Making a Distress call ■ ................................................26

Making DSC calls ■ .......................................................30

Receiving DSC calls ■ ..................................................53

Transmitted Call log ■ ....................................................60

Received Call log ■ .......................................................61

TABLE OF CONTENTS (continued)

DSC Settings ■ .............................................................63

Making an Individual call using an AIS transponder ■ ..67

8 OTHER FUNCTIONS .....................................................69

Using the Intercom ■ .....................................................69

Using the RX Speaker ■ ................................................70

Using the PA (Public A ■ ddress) ...................................70

Using the Horn ■ ...........................................................71

9 MENU SCREEN OPERATION ......................................72

Using the Menu screen ■ ..............................................72

Menu screen items ■ .....................................................73

Radio Settings items ■ ..................................................74

Conﬁguration items ■ ....................................................76

10 CONNECTIONS AND MAINTENANCE ........................82

Connections ■ ...............................................................82

Antenna ■ ......................................................................84

Fuse replacement ■ ......................................................84

Cleaning ■ .....................................................................84

Supplied accessories ■ .................................................84

Mounting the transceiver ■ ............................................85

MB-132 installation ■ ....................................................86

Microphone installation ■ ..............................................87

11 SPECIFICATIONS AND OPTIONS ...............................89

Speciﬁcations ■ .............................................................89

Options ■ .......................................................................90

12 CHANNEL LIST .............................................................91

13 TROUBLESHOOTING ...................................................92

14 TEMPLATE ....................................................................93

INDEX .................................................................................95

OPERATING RULES

Priorities D

•Read allrules and regulationspertainingtocallpriorities,

and keep an up-to-date copy handy. Safety and distress

calls take priority over all others.

•YoumustmonitorChannel16whenyouarenotoperating

on another channel.

•Falseorfraudulentdistresscallsareprohibitedunderlaw.

Privacy D

•Informationoverheard,butnotintendedforyou,cannotlaw-

fully be used in any way.

•Indecentorprofanelanguageisprohibited.

Radio licenses D

(1) SHIP STATION LICENSE

You may require a current radio station license before using

the transceiver. It is unlawful to operate a ship station which is

not licensed, but required to be.

If required, contact your dealer or the appropriate govern-

ment agency for a Ship-Radiotelephone license application.

This government-issued license states the call sign which is

your craft’s identiﬁcation for radio purposes.

(2) OPERATOR’S LICENSE

A Restricted Radiotelephone Operator Permit is the license

most often held by small vessel radio operators when a radio

is not required for safety purposes.

If required, the Restricted Radiotelephone Operator Permit

must be posted or kept with the operator. If required, only a

licensed radio operator may operate a transceiver.

However, non-licensed individuals may talk over a transceiver

if a licensed operator starts, supervises, ends the call and

makes the necessary log entries.

A current copy of the applicable government rules and regu-

lations is only required to be on hand for vessels in which

a radio telephone is compulsory. However, even if you are

not required to have these on hand it is your responsibility to

be thoroughly acquainted with all pertinent rules and regula-

tions.

New2001New2001

PANEL DESCRIPTION

■ Front panel

Function display (p. 5)Speaker

q DISTRESS KEY [DISTRESS] (pp. 26, 27)

Hold down for 3 seconds to make a Distress call.

w ENTER KEY [ENT] (pp. 9, 12, 72)

Push to set the entered data, selected item, and so on.

e LEFT AND RIGHT KEYS [Ω]/[≈]

Push to change to the previous or next key function that ➥

is assigned to the softkeys. (p. 7)

Push to select the desired character or number in the ➥

table while in the channel name, position, MMSI code

entry mode, and so on. (pp. 9, 16, 25)

UP AND DOWN/CHANNEL SELECT KEYS [∫•CH]/[√•CH]

Push to select the operating channels, Menu items, ➥

Menu settings, and so on. (pp. 14, 72)

While scanning, push to check Favorite channels, ➥

change the scanning direction or manually resume a

scan. (p. 20)

t CLEAR KEY [CLEAR]

(pp.

)

Push to cancel the entered data, or to return to the previ-

ous screen.

y MENU KEY [MENU]

(p.

)

Push to enter or exit the Menu screen.

u VOLUME AND SQUELCH SWITCH/POWER SWITCH

[VOL/SQL•PWR]

When the power is OFF, hold down for 1 second to turn ➥

ON power. (p. 14)

Hold down for 1 second to turn OFF power. ➥

When the power is ON, push to enter the volume level ➥

adjustment mode.* (p. 15)

  •Eachpushofthisswitchtogglesthemodebetweenthevol-

ume level adjustment, squelch threshold level adjustment,

operating channel selection, and the LCD and key backlight

brightness adjustment, if assigned.

Rotate to adjust the volume level.* (p. 15) ➥

*The desired function can be assigned in the Menu screen.

New2001

PANEL DESCRIPTION

i CHANNEL 16/CALL CHANNEL KEY [16/C]

Push to select Channel 16. (p. 11) ➥

Hold down for 1 second to select the Call channel. (p. ➥

)

  •“CALL”isdisplayedwhentheCallchannelisselected.

➥

When the Call channel is selected, hold down for 3 sec-

onds to enter Call channel entry mode. (p.

)

o SOFTKEYS

Desired functions as described below can be assigned in

the Menu screen.

Scan [

] (p. 20)

Push to start or stop a Normal or Priority scan.

Dualwatch/Tri-watch [

] (p. 21)

Push to start Dualwatch or Tri-watch. ➥

Push to stop Dualwatch or Tri-watch when either is ac- ➥

tivated.

High/Low [

] (p. 14)

Push to set the power to high or low.

 •Somechannelsaresettoonlylowpower.

Channel/Weather channel [ ]* (pp. 11, 13)

Push to selects and toggles the regular channel and

Weather channel.

*For only U.S.A. and Australian version transceivers.

Channel [ ]* (p. 11)

Push to select a regular channel.

* For only IC-M423 and IC-M423G except for Australian version

transceivers.

Public address [ ] (p. 70)

Push to enter the PA (Public Address) mode.

RX Speaker [

] (p. 70)

Push to turn the RX Speaker mode ON or OFF.

Horn [

] (p. 71)

Push to enter the Horn mode.

Intercom [

] (p. 69)

Push to enter the Intercom mode.

LO/DX [

]* (p. 14)

Push to turn the Attenuator function ON or OFF.

 •“LOCAL”isdisplayedwhentheAttenuatorfunctionisON.

*For only U.S.A. and Australian version transceivers.

AquaQuake [ ] (p. 18)

Holding down to activate the AquaQuake to clear water

away from the speaker grill.

PANEL DESCRIPTION

New2001

■ Front panel (Continued)

Function display (p. 5)Speaker

Favorite channel [ ] (p. 20)

Push to set or clear the displayed channel as a Favorite ➥

(Tag) channel.

Hold down for 3 seconds to clear or set all Favorite ➥

channels in the selected channel group.

Name [

] (p. 16)

Push to enter the channel name entry mode.

Backlight [ ] (p. 18)

Push to enter the LCD and key backlight brightness ad-

justment mode.

 •Whileintheadjustmentmode,push[∫]/[√]/[Ω]/[≈] or rotate Dial

to adjust the brightness of the LCD and key backlight.

Log [ ] (p. 61)

Push to enter “RCVD CALL LOG” in the DSC CALLS menu.

PANEL DESCRIPTION

New2001

■ Function display

qw ietr!0you

q BUSY/TRANSMIT ICON (p. 14)

“ ➥

” is displayed when receiving a signal or when

the squelch is open.

“ ➥

” is displayed while transmitting.

w POWER ICON (p. 14)

“25W” is displayed when high power is selected. ➥

“1W” is displayed when low power is selected. ➥

e RX SPEAKER ICON (p. 70)

Displayed while in the RX Speaker mode.

r CHANNEL GROUP ICON (p. 12)

Shows which channel group is selected, INT, USA, ➥

CAN, ATIS or DSC, depending on the version.

“WX” is displayed when the weather channel is select- ➥

ed.*

*For only U.S.A. and Australian version transceivers.

t CALL CHANNEL ICON (p. 11)

Displayed when the Call channel is selected.

y DUPLEX ICON (p. 12)

Displayed when a duplex channel is selected.

u FAVORITE CHANNEL ICON (p. 20)

Displayed when a Favorite (Tag) channel is selected.

i MESSAGE ICON (p. 61)

Blinks when there is an unread DSC message.

o GPS ICON

Stays ON when the built-in GPS receiver* or an exter- ➥

nal GPS receiver is receiving valid position data.

*For only IC-M423G and IC-M424G.

Blinks when searching for valid position data. ➥

!0 SWITCH ICON (p. 64)

Displayed when the “CH 16 SWITCH” in DSC Settings is

set to OFF.

PANEL DESCRIPTION

■ Function display (Continued)

qw ietr!0you

!1 LOW BATTERY ICON

Blinks when the battery voltage drops to approximately

10 V DC or less.

!2 CHANNEL NUMBER READOUT

Shows the selected operating channel number.

 •Whenasimplexchannelisselected,“A”isdisplayed.

!3 CHANNEL NAME FIELD

The channel name is displayed, if entered. (p. 16)

!4 KEY ICON (p. 7)

Shows the preset function of the softkeys on the front pan-

el.

!5 TIME ZONE INDICATOR

Shows the current time when GPS data is received, or ➥

the time is manually entered.

  •When theGPS current time isinvalid,“??” will blinkevery

2 seconds instead of the current time. After 23.5 hours has

passed, “NO TIME” is displayed.

  •“??”

will

blink every 2 seconds instead of the current time,

after 4 hours have passed from when the time was manu-

ally entered. The manually entered time is held for only 23.5

hours, and after that, “NO TIME” is displayed.

“LOCAL” ➥

is displayed

when the offset time is set.

“MNL” ➥

is displayed

when

the time is manually entered

“UTC” ➥

is displayed

when

the GGA, GLL or GNS GPS

sentence format is included in the GPS signal.

The date information ➥

is displayed

when

the RMC GPS

sentence format is included in the GPS signal.

“NO TIME” ➥

is displayed

when no GPS receiver is con-

nected, and no time is manually entered.

NOTE for the IC-M423 and IC-M424:

These models do not come with a built-in GPS receiver.

Therefore an external GPS receiver needs to be con-

nected, or the time needs to be manually entered for

the time zone indicator to be displayed.

PANEL DESCRIPTION

New2001

!6 POSITION INDICATOR

➥ Shows the current position when position data is re-

ceived, or the position is manually entered.

  •WhentheGPSpositionisinvalid,“??”mayblinkevery2sec-

onds instead of position. The last position is held for only

23.5 hours, and after that, “NO POSITION” is displayed.

  •

“??”willblinkevery2secondsinsteadofposition,after4hours

have passed from the time when the position is manually en-

tered. The manually entered position is held for only 23.5 hours,

and after that, “NO POSITION” is displayed.

➥ “NO POSITION” is displayed when no GPS receiver is

connected, and no position is manually input.

!7 SCAN INDICATOR

“SCAN 16” is displayed during a Priority scan; “SCAN” ➥

is displayed during a Normal scan. (p. 20)

“DUAL 16” is displayed during Dualwatch; “TRI 16” is ➥

displayed during Tri-watch. (p. 20)

!8 LOCAL ICON* (p. 14)

Displayed when the Attenuator function is turned ON.

*For only U.S.A. and Australian version transceivers.

■ Softkey function

Various functions can be assigned to the softkeys. When a

key function is assigned, the key icon is displayed above the

softkey, as shown below.

Softkey function selection D

When “Ω” or “≈” is displayed beside the key icon, sequentially

pushing [Ω]/[≈] displays the previous or the next key function

that is assigned to the softkey.

Push Push

*Push this key to start

and stop scan.

The order of the key icons may differ, depending on the

presetting.

PANEL DESCRIPTION

New2001 New2001

Speaker Microphone ■

Microphone

Speaker

IC-M423G/IC-M424G IC-M423/IC-M424

q PTT [PTT]

Hold down to transmit, release to receive. (p. 14)

w CHANNEL UP/DOWN KEYS [Y]/[Z]

Push either key to check Favorite channels, change scan-

ning direction or manually resumes a scan. (pp. 14, 20)

e TRANSMIT POWER KEY [H/L]*

Push to toggle the power high or low. (p. 14) ➥

  •Somechannelsaresettoonlylowpower.

While holding down [H/L], turn ON the power to turn the ➥

Microphone Lock function ON or OFF. (p. 17)

* [HI/LO] is printed for the IC-M423/IC-M424.

r CHANNEL 16/CALL CHANNEL KEY [16/C]

➥ Push to select Channel 16. (p. 11)

➥ Hold down for 1 second to select the Call channel. (p.

)

  •The“CALL”icon is displayed when the Call channel isse-

lected.

*For only IC-M423G and IC-M424G.

PREPARATION

New2001

Entering the ■ MMSI code

The 9 digit MMSI (Maritime Mobile Service Identity: DSC self

ID) code can be entered at power ON.

This initial code setting can be made only once.

After being set, it can be changed by only your dealer

or distributor. If your MMSI code has already been en-

tered, the following steps are not necessary.

Hold down [PWR](Dial) to turn ON the power. q

 •Threeshortbeepssound,and“NODSCMMSI”isdisplayed.

Push [ENT] to start the MMSI code entry. w

 •Push[CLEAR]twicetocanceltheentry,andgotothenormal

operating screen. In this case, the transceiver cannot make a

DSC call. To enter the MMSI code, turn OFF the power, then turn

it ON again.

Enter your MMSI code in the following way: e

 •SelectadesirednumberusingDial,or[∫]/[√]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

Repeat step r e to enter all 9 digits.

After entering the 9 digit code, “FINISH” is automatically t

selected, and then push [ENT] or Dial to set it.

The “MMSI CONFIRMATION” screen is displayed. y

Enter your MMSI code again for confirmation. u

 •Enterinthesamewayasstepse through t.

When your MMSI code entry is successfully completed, i

the screen as shown below is brieﬂy displayed.

 •Afterthat,thenormaloperatingscreenisdisplayed.

The entered MMSI code can be checked in the MENU screen.

(p. 72)

NOTE: Depending on the transceiver version, the ATIS

code entry may be required after entering the MMSI code.

See the next page for details.

PREPARATION

New2001 New2001

The 10 digit ATIS (Automatic Transmitter Identiﬁcation Sys-

tem) code can be entered at power ON.

This initial code setting can be made only once.

After being set, it can be changed by only your dealer

or distributor. If your ATIS code has already been en-

tered, the following steps are not necessary.

After entered the MMSI code, “Push [ENT] to Register q

Your ATIS” is displayed.

Push [ENT] to start entering the ATIS code. w

 •Push[CLEAR]twicetocanceltheentry,andgotothenormal

operating mode. In this case, the ATIS function is disabled. To

enter the ATIS code, turn OFF the power, then turn it ON again.

Enter your ATIS code in the following manner: e

 •SelectadesirednumberusingDial,or[∫]/[√]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

Repeat step r e to enter all 10 digits.

After entering the 10 digit code, “FINISH” is automatically t

selected, and then push [ENT] or Dial to set it.

The “ATIS CONFIRMATION” screen is displayed. y

Enter your ATIS code again for conﬁrmation. u

 •Enterinthesamemannerasstepse through t.

When your ATIS code is successfully entered, the screen i

as shown below is brieﬂy displayed.

 •Afterthat,thenormaloperatingscreenisdisplayed.

The entered ATIS code can be checked in the MENU screen.

(p. 72)

Entering the ■ ATIS code (For Dutch and German version transceivers)

BASIC OPERATION

New2001

Selecting a Channel ■

D Channel 16

Channel 16 is the distress and safety channel. It is used for

establishing initial contact with a station and for emergency

communications. Channel 16 is monitored during both Du-

alwatch and Tri-watch. While standing by, you must monitor

Channel 16.

Push [16/C] to select Channel 16. ➥

Push [CH/WX]* to return to the screen displayed before ➥

you selected Channel 16, or push [Y]/[Z] to select an op-

erating channel.

* [CHAN] is displayed instead of [CH/WX] for the IC-M423/IC-

M423G except for Australian version.

D Call channel

Each regular channel group has a separate leisure use Call

channel. The Call channel is monitored during Tri-watch. The

Call channel data can be entered. The channels used to

store your most often used channel in each channel group,

for quick recall. (p. 16)

Hold down [16/C] for 1 second to select the Call channel of ➥

the selected channel group.

 •“CALL”andtheCallchannelnumberisdisplayed.

 •Eachchannelgrouphasanindependentcallchannelafterentry.

(p. 16)

Push [CH/WX]* to return to the screen displayed before ➥

you selected Call channels, or push [Y]/[Z] to select an

operating channel.

* [CHAN] is displayed instead of [CH/WX] for the IC-M423/IC-

M423G except for Australian version.

BASIC OPERATION

■ Selecting a Channel (Continued)

Selecting the D Channel group

There are preset international channels in the IC-M423/IC-

M423G/IC-M424/IC-M424G. Except for the European ver-

sions, you can select a channel group suitable for your oper-

ating area, as described below.

Push [MENU]. q

Rotate Dial or push [ w ∫]/[√] to select “Radio Settings,” and

then push [ENT].

Rotate Dial or push [ e ∫]/[√] to select “CHAN Group,” and

then push [ENT].

Rotate Dial or push [ r ∫]/[√] to select the desired channel

group, and then push [ENT].

 •U.S.A.,(USA)International(INT),CAN(Canada),ATISorDSC

channel groups may be selected, depending on the transceiver

version.

 •Push[BACK]toreturntothepreviousscreen.

Push [EXIT] to exit the Menu screen. t

Push [ y ∫]/[√] to select a channel.

 •Pushing[Y]/[Z] on the microphone selects only Favorite chan-

nels.

 •“DUP”isdisplayedwhenaduplexchannelisselected.

 •“A”isdisplayedwhenasimplexchannelisselected.

When the U.S.A channel group is selected.

Channel group icon is displayed

BASIC OPERATION

Selecting a D Weather channel

(For Only U.S.A. and Australian version transceivers)

The transceiver has 10 weather channels. These are used for

monitoring broadcasts from NOAA. (National Oceanographic

and Atmospheric Administration)

The transceiver can automatically detect a weather alert tone

on the selected weather channel, or while scanning. (p. 19)

Push [CH/WX] once or twice to select a weather channel. q

 •“WX”isdisplayedwhenaweatherchannelisselected.

 •“WX ” is displayed when the Weather Alert function is ON. (p.

75)

Push [ w ∫]/[√] to select a channel.

 •Pushing[Y]/[Z] on the microphone also selects a channel.

When weather alert is OFF.

When weather alert is ON.

BASIC OPERATION

■ Receiving and transmitting

CAUTION: Transmitting without an antenna will damage

the transceiver.

Hold down [PWR](Dial) to turn ON the power. q

Set the audio and squelch levels. (p. 15) w

First, open the squelch. Then, adjust the audio output ➥

level. After that, adjust the squelch level until the noise

just disappears.

Change the channel group. (p. 12) e

Push [ r ∫]/[√] to select a channel. (pp. 11, 12)

 •Pushing[Y]/[Z] on the microphone selects only Favorite chan-

nels.

 •When receiving a signal, “ ” is displayed and audio is

heard.

 •Furtheradjustmentofthevolumelevelmaybenecessary.

Push [LO/DX] to turn the receive Attenuator function ON t

or OFF, if necessary.

 •ForonlyU.S.A.andAustralianversiontransceivers.

 •“LOCAL” is displayed when the receive Attenuator function is

ON.

Push [HI/LO] to select the output power, if necessary. y

 •Pushing[H/L]or[HI/LO]onthemicrophonealsoselecttheout-

put power.

 •“25W” is displayed when high power is selected, and “1W” is

displayed when low power is selected.

 •Chooselowpowerforshortrangecommunications,choosehigh

power for longer distance communications.

 •Somechannelsareforonlylowpower.

Hold down [PTT] to transmit, then speak at your normal u

voice level.

 •“ ” is displayed.

 •Channel70cannotbeusedfortransmissionotherthanDSC.

Release [PTT] to receive. i

Information ✓

The Noise Cancel function reduces random noise components

in the transmit and/or receive signal. See page

for details.

Simplex channels, 3, 21, 23, 61, 64, 81, 82, and 83 CAN-

NOT be lawfully used by the general public in U.S.A. wa-

ters.

IMPORTANT: To maximize the readability of your transmit-

ted signal, pause a few seconds after pushing [PTT], hold

the microphone 5 to 10 cm (2 to 4 inches) from your mouth

and speak at a normal voice level.

NOTE for the TOT (Time-out Timer) function ✓

The TOT function inhibits continuous transmission beyond a

preset time period after the transmission starts.

10 seconds before transmission is cutoff, a beep sounds to

indicate the transmission will be shut down and “TOT” is dis-

played in the channel name ﬁeld. Transmission is not possible

for 10 seconds after this shut down.

BASIC OPERATION

Microphone

t y

Microphone

IC-M423G/IC-M424G IC-M423/IC-M424

Adjusting the ■ volume and

squelch levels

The volume and squelch levels can be adjusted with [VOL/

SQL](Dial).

Push [VOL/SQL](Dial) one or more times to display the q

volume or squelch adjustment screen.

Rotate [VOL/SQL](Dial) w or push [∫]/[√]/[Ω]/[≈] to adjust

the volume or squelch level.

 •Thetransceiverhas20volumelevelsandOFF.

 •The transceiver has 11 squelch levels. OPEN is completely

open, 10 is tight squelch, 1 is loose squelch.

 •Ifnokeyispushforabout5seconds,thetransceiversetsthe

selected volume level, and returns to the normal mode.

Push [ENT] to set the level, and exit the volume adjust- e

ment mode.

 •Push[CLEAR]tocancel.

The desired function can be assigned to Dial. See page 77

for details.

BASIC OPERATION

New2001

■ Entering a Call channel data

You can enter data in Call channel in each channel group for

quick recall.

Select the desired channel group (INT, USA, CAN, ATIS, q

or DSC) to be entered. (p. 12)

Hold down [16/C] for 1 second to select the Call channel of w

the selected channel group.

 •“CALL”andtheCallchannelnumberisdisplayed.

Hold down [16/C] again for 3 seconds (until a long beep e

changes to 2 short beeps) to enter the Call channel entry

mode.

Rotate Dial or push [ r ∫]/[√] to select a channel.

Push [ENT] to save the displayed channel as the Call t

channel.

 •Push[CLEAR]tocancel.

Entering a ■ Channel name

Enter a name of up to 10 characters.

Capital letters, 0 to 9, some symbols, (! " # $ % & ' ( ) * + , – .

/[\]^_:;<=>?)andaspacecanbeentered.

Push [ q ∫]/[√](CH) to select a channel.

 •First, canceltheDualwatch,Tri-watchorScan function,ifacti-

vated.

Push [NAME] to open the channel name enter screen. w

 •Acursorisdisplayedontherstcharacter.

Enter the desired channel name in the following manner: e

 •SelectadesiredcharacterusingDial,or[∫]/[√]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •Push[123],[!$?],or[ABC]toselectacharactergroup.

 •Select“SPACE,”thenpush[ENT]toenteraspace.

 •Select“DELETE,”thenpush[ENT]todeleteacharacter.

 •Push[CLEAR]tocancelandreturntothepreviousscreen.

BASIC OPERATION

New2001

Repeat step r e to input all characters.

Push [ t Ω]/[≈]/[∫]/[√] to select “FINISH,” then push [ENT] to

set the name and return to the previous screen.

■ Microphone Lock function

The Microphone Lock function electrically locks [∫], [√],

[16/C],*

and the [H/L]*

keys on the supplied microphone.

This prevents accidental channel changes and function ac-

cess.

For only IC-M423G and IC-M424G.

[HI/LO] is printed for the IC-M423 and IC-M424.

While holding down [H/L] or [HI/LO] on the microphone, ➥

hold down [PWR](Dial) to turn ON the transceiver and turn

the Microphone Lock function ON or OFF.

[HI/LO]

[Y]/[Z]

[H/L]

[16/C]

IC-M423G/IC-M424G IC-M423/IC-M424

BASIC OPERATION

New2001

Adjusting the ■ Backlight level

The function display and keys can be backlit for better visibil-

ity under low light conditions.

The backlight is adjustable in 7 levels and OFF.

The adjustment method, described below differs depending

on the presetting.

Push [BKLT] to show the backlight adjustment screen. Ro- ➥

tate Dial or push [∫]/[√]/[Ω]/[≈] to adjust the brightness of

the LCD and key backlight, and then, push [ENT].

 •Ifnokeyoperationisperformedforabout5seconds,thetransceiver

sets the selected backlight level, and returns to the normal mode.

When the Backlight function is assigned to the [VOL/

SQL](Dial):

Push [VOL/SQL](Dial) one or more times to display the q

backlight adjustment screen.

Rotate [VOL/SQL](Dial) to adjust the brightness of the w

LCD and key backlight, and then, push [ENT].

The desired function can be assigned to Dial. See page 77

for details.

Using the ■ AquaQuake water

draining function

The AquaQuake water draining function clears water away

from the speaker grill. Without this function, water may mufﬂe

the sound coming from the speaker. A buzzing sound is heard

when this function is activated.

While holding down [AQUA], the AquaQuake function is ➥

activated to clear water away from the speaker grill.

 •Whileholdingdown[AQUA],alowbuzzingsoundstodrainwa-

ter, regardless of the volume level setting.

 •The transceiver keys, except [DISTRESS], are disabled while

the AquaQuake function is activated.

When the AquaQuake function is activated.

SCAN OPERATION

New2001

■ Scan types

Scanning is an efﬁcient way to locate signals quickly over a

wide frequency range. The transceiver has a Priority scan

and a Normal scan.

When the Weather Alert function* is ON, the weather channel

is also checked while scanning. (p. 75)

*For only U.S.A and Australian version transceivers.

Set the Favorite channels (scanned channel) before scan-

ning. Clear the Favorite channels which inconveniently stop

scanning, such as those for digital communication use. (Refer

to the next page for details.)

Choose Priority or Normal scan in the Menu screen. (p.

)

PRIORITY SCAN

The Priority scan sequentially searches through all Favor-

ite channels while monitoring Channel 16. When a signal is

detected on Channel 16, the scan pauses until the signal

disappears. When a signal is detected on a channel other

than Channel 16, the scan becomes a Dualwatch until the

signal disappears.

NORMAL SCAN

The Normal scan, like the Priority scan, sequentially

searches through all Favorite channels. However, unlike

the Priority scan, Channel 16 is not checked unless it is set

as a Favorite channel.

WX*

CH 01

CH 16

CH 02

CH 05 CH 04

CH 03

*When the weather alert function is activated.

(For only U.S.A and Australian version transceivers.)

CH 01 CH 02

WX*

CH 05 CH 04

CH 03

*When the weather alert function is activated.

(For only U.S.A and Australian version transceivers.)

New2001

SCAN OPERATION

New2001

Setting ■ Favorite channels

For more efﬁcient scanning, add desired channels as Favor-

ite channels, or clear the Favorite on unwanted channels.

Channels that are not tagged will be skipped while scanning.

Favorite channels can be independently assigned to each

channel group (INT, USA, CAN, ATIS, or DSC).

Select the desired channel group. (p. q

)

Select the desired channel to be set as a Favorite channel. w

Push [ e ] to set the displayed channel as a Favorite channel.

 •“” is displayed on the display.

To cancel the Favorite channel setting, repeat step r e.

 •“” disappears.

Clearing (or setting) all Favorite channels ✓

Hold down [] for 3 seconds (until a long beep changes to

2 short beeps) to clear all Favorite channel settings in the

selected channel group.

•RepeataboveproceduretosetallchannelsasFavoritechannels.

■ Starting a scan

First, set the scan type (Priority or Normal scan) and scan

resume timer in the Menu screen. (p. 74)

Select the desired channel group. (p. q

)

Set the Favorite channels, as described to the left. w

Make sure the squelch is closed to start a scan. e

Push [SCAN] to start a Priority or Normal scan. r

 •“SCAN 16”is displayed during a Priority scan;“SCAN” isdis-

played during a Normal scan.

 •Whenasignalisdetected,thescanpausesuntilthesignaldis-

appears, or resumes after pausing 5 seconds, depending on the

setting. (Channel 16 is still monitored during a Priority scan.)

 •Push[Y]/[Z] on either transceiver or microphone, to check the

scanning Favorite channels, change the scanning direction or

manually resume the scan.

 •Abeeptonesoundsand“16”blinkswhenasignalisreceivedon

Channel 16 during a Priority scan.

To stop the scan, push [CLEAR] or repeat step t r.

Scan starts. When a signal is received.

Push

[SCAN]

[Example]: Starting a Normal scan.

DUALWATCH/TRI-WATCH

New2001

Description ■

Dualwatch monitors Channel 16 while you are receiving

on another channel; Tri-watch monitors Channel 16 and the

Call channel while receiving another channel. Dualwatch and

Tri-watch are convenient for monitoring Channel 16 when you

are operating on another channel.

Operation ■

Select Dualwatch or Tri-watch in the Menu screen. (p. 74) q

Push [ w Y]/[Z] to select the desired operating channel.

Push [DW] to start a Dualwatch or Tri-watch scan. e

 •“DUAL16”isdisplayedduringDualwatch;“TRI16”isdisplayed

during Tri-watch.

 •AbeeptonesoundswhenasignalisreceivedonChannel16.

To cancel Dualwatch or Tri-watch, push [DW] again. r

DUALWATCH/TRI-WATCH SIMULATION

Dualwatch

Tri-watch

Call channel

Ch 88

Ch 16

Ch 88

Ch 16

Ch 88

Ch 75

•IfasignalisreceivedonChannel16,DualwatchandTri-

watch pause on Channel 16 until the signal disappears.

•IfasignalisreceivedontheCallchannelduringTri-watch,

Tri-watch becomes Dualwatch until the signal disap-

pears.

•TotransmitontheselectedchannelduringaDualwatchor

Tri-watch scan, hold down [PTT].

[Example]: Operating Tri-watch on INT Channel 25.

Tri-watch starts.

Signal is received on

Call channel.

Tri-watch resumes after the

signal disappears.

Signal received on Channel

16 takes priority.

New2001

DSC OPERATION

DSC address ID ■

D Entering an Individual ID

A total of 100 DSC address IDs can be entered and assigned

a name of up to 10 characters.

Enter “INDIVIDUAL ID” in the DSC SETTINGS menu. q

Push [ADD]. w

 •The“INDIVIDUALID”entryscreenisdisplayed.

Enter a desired individual ID in the following way: e

 •SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

The ﬁrst digit is speciﬁed as ‘0,’ and the second digit is

other than ‘0’ for a Group ID.

The ﬁrst two digits are ‘0’ for any Coast station ID.

Repeat step r e to enter all 9 digits.

After entering the 9 digit code, push [ENT] or Dial to set it. t

 •TheIDnameentryscreenisdisplayed.

Enter a desired 10 digit ID name in the following way: y

 •SelectadesiredcharacterusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •Push[123],[!$?],or[ABC]toselectacharactergroup.

After entering the ID name, select “FINISH” using Dial, or u

[Y]/[Z]/[Ω]/[≈], then push [ENT] or Dial to program it.

 •The“INDIVIDUALID”listscreenisdisplayed.

Push [MENU] to exit the MENU screen. i

MENU ➪ DSC Settings  ➪ 

Individual ID



(Push [MENU].)

(Rotate Dial, then push [ENT].)

New2001

DSC OPERATION

D Entering a Group ID

Enter “GROUP ID” in the DSC SETTINGS menu. q

Push [ADD]. w

 •The“GROUPID”entryscreenisdisplayed.

Enter a desired group ID in the following way: e

 •SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

The ﬁrst digit is speciﬁed as ‘0,’ and the second digit is

other than ‘0’ for a Group ID.

The ﬁrst two digits are ‘0’ for any Coast station ID.

Repeat step r e to input the speciﬁc 9 digits group code.

After entering the 9 digit code, push [ENT] or Dial to set it. t

 •GroupIDnameentryscreenisdisplayed.

Enter a desired 10 digit ID name in the following way: y

 •SelectadesiredcharacterusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •Push[123],[!$?],or[ABC]toselectacharactergroup.

After entering the ID name, select “FINISH” using Dial, or u

[Y]/[Z]/[Ω]/[≈], then push [ENT] or Dial to save it.

 •The“GROUPID”listscreenisdisplayed.

Push [MENU] to exit the MENU screen. i

MENU ➪ DSC Settings ➪ 

Group ID



(Push [MENU].)

(Rotate Dial, then push [ENT].)

DSC OPERATION

■ DSC address ID (Continued)

D Deleting Individual and Group IDs

Enter “INDIVIDUAL ID” or “GROUP ID” in the DSC SET- q

TINGS menu.

 •WhennoaddressIDisentered,“NoID”isdisplayed.Inthiscase,

push [MENU] to exit the MENU screen.

Rotate Dial or push [ w Y]/[Z] to select a desired ID name,

then push [DEL].

Push [OK] to delete the ID, and return to the “INDIVIDUAL e

ID” or “GROUP ID” list screen.

 •Push[CANCEL]tocancelit.

Push [MENU] to exit the MENU screen. r

MENU ➪ DSC Settings ➪ 

Individual ID

/

Group ID



(Push [MENU].)

(Rotate Dial, then push [ENT].)

DSC OPERATION

A Distress call should include the ship’s position and time.

If no GPS receiver is connected and built-in GPS receiver*

is not receiving valid position data, your position and UTC

(Universal Time Coordinated) time should be manually en-

tered. They are automatically included when a GPS receiver

compatible with the NMEA 0183 (ver. 2.0 or later) format is

connected.

*For only IC-M423G and IC-M424G.

•Manual entry is disabledwhen a GPS receiveris con-

nected.

•Manuallyenteredpositionandtimewillbeheldforonly

23.5 hours.

Enter “POSITION INPUT” in the DSC SETTINGS menu. q

Enter your latitude and longitude position using Dial, or w

[Y]/[Z]/[Ω]/[≈].

 •SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •SelectN(Northlatitude)orS(Southlatitude)whenthecursoris

on the ‘N’ or ‘S’ position.

 •SelectW(Westlongitude)orE(Eastlongitude)whenthecursor

is on the ‘W’ or ‘E’ position.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

After entering the position, push [ENT] to save it. e

The UTC time entry screen is displayed, enter the UTC r

time in the following way:

 •SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

Push [ENT] or Dial to program your position and time. t

 •Returntothe“DSCSETTINGS”screen.

Entering ■ position and time

MENU ➪ DSC Settings ➪ Position Input

(Push [MENU].)

(Rotate Dial, then push [ENT].)

DSC OPERATION

■ Making a Distress call

A Distress call should be made if, in the opinion of the Master,

that the ship or a person is in distress and requires immediate

assistance.

NEVER MAKE A DISTRESS CALL IF YOUR SHIP OR A

PERSON IS NOT IN AN EMERGENCY. A DISTRESS

CALL SHOULD BE MADE ONLY WHEN IMMEDIATE

HELP IS NEEDED.

Simple call D

While lifting up the key cover, hold down [DISTRESS] for 3 q

seconds to transmit the Distress call.

 •Whileholdingdown[DISTRESS],countdownbeepssoundand

both the key and display backlighting blink.

 •DSC channel (Channel 70) is automatically selected and the

Distress call is transmitted.

After transmitting the call, the transceiver waits for an ac- w

knowledgment call.

 •The Distress call is automatically transmittedevery 3.5 to 4.5

minutes, until an acknowledgement is received (‘Call repeat’

mode), or DSC Cancel call is made. (p. 29)

 •Push[RESEND]tomanuallytransmittheDistressrepeatcall.

 •Push [Ω]/[≈] then push [INFO] to display the transmitted Dis-

tress call information.

 •Push[Ω]/[≈] then push [PAUSE] to pause the ‘Call repeat’ mode,

push [RESUME] to resume it.

After receiving the acknowledgment, push [ALARM OFF] e

then reply using the microphone.

A distress alert default contains: ➥

 •Natureofdistress: Undesignateddistress

 •Positioninformation:ThelatestGPSormanuallyenteredposi-

tion is held for 23.5 hours, or until the power

is turned OFF.

DSC OPERATION

Making a Regular call D

The nature of the Distress call should be included in the Dis-

tress call.

Enter “DISTRESS CALL” in the DSC CALLS menu. q

Select the nature of the distress using Dial or [ w Y]/[Z], then

push Dial or [ENT].

 •‘Undesignated,’‘Fire,Explosion,’‘Flooding,’‘Collision,’‘Grounding,’

‘Capsizing,’ ‘Sinking,’ ‘Adrift,’ ‘Abandoning ship,’ ‘Piracy’ or ‘Man

Overboard’ are selectable.

 •Thenatureofthedistressisstoredfor10minutesafterselect-

ing.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

The Distress call conﬁrmation screen is displayed. e

 •RotateDialorpush[Y]/[Z] to see the hidden lines.

Hold down [DISTRESS] for 3 seconds to transmit the Dis- r

tress call.

 •Whileholdingdown[DISTRESS],countdownbeepssoundand

both the key and display backlighting blink.

 •Theselectednatureofthedistressisstoredfor10minutes.

MENU ➪ DSC Calls ➪ Distress Call

(Push [MENU].)

(Rotate Dial, then push [ENT].)

DSC OPERATION

■ Making a Distress call (Continued)

After transmitting the call, the transceiver waits for an ac- t

knowledgment call.

 •The Distress call is automatically transmittedevery 3.5 to 4.5

minutes, until an acknowledgement is received (‘Call repeat’

mode), or DSC cancel call is made. (p. 29)

 •Push[RESEND]tomanuallytransmittheDistressrepeatcall.

 •Push [Ω]/[≈] then push [INFO] to display the transmitted Dis-

tress call information.

 •Push[Ω]/[≈] then push [PAUSE] to pause the ‘Call repeat’ mode,

push [RESUME] to resume it.

After receiving an acknowledgment call, push [ALARM y

OFF] then reply using the microphone.

A distress alert contains: ➥

 •Natureofdistress:  Selectedinstepw.

 •Positioninformation: The latest GPS or manually entered

position is held for 23.5 hours, or until

the power is turned OFF.

When no GPS receiver is connected and built-in GPS re-

ceiver* is not receiving valid position data, and both posi-

tion and time have been manually entered, the screen as

shown below is displayed. Edit your latitude and longitude

position and UTC time as follows:

*For only IC-M423G and IC-M424G.

Push [CHG], then edit your latitude and longitude posi- ➥

tion and UTC time.

 •SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •SelectN(Northlatitude)orS(Southlatitude)whenthecursor

is on the ‘N’ or ‘S’ position.

 •SelectW(Westlongitude)orE(Eastlongitude)whenthecur-

sor is on the ‘W’ or ‘E’ position.

DSC OPERATION

D Canceling a Distress call

While waiting for an acknowledgment call, push [CAN- q

CEL].

Push [CONTINUE]. w

 •Push[BACK]toreturntowaitingforanacknowledgementcall.

Push [FINISH]. e

 •Push[EXIT]toreturntowaitingforanacknowledgementcall.

The Distress cancel call is transmitted. r

Channel 16 is automatically selected. t

 •Reportyoursituationusingthemicrophone.

 •Afterthereport, push[EXIT]toreturntothenormaloperating

mode.

DSC OPERATION

Making DSC calls ■

To ensure correct operation of the DSC function, make

sure you correctly set the CH70 SQL LEVEL. (p. 65)

D Making an individual call

The Individual call function allows you to make a DSC call to

only a speciﬁc station.

Enter “INDIVIDUAL CALL” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Individual Call

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Select a desired preset individual address, or “Manual In- w

put,” using Dial or [Y]/[Z], then push Dial or [ENT].

 •TheIDcodefortheIndividualcallcanbeenteredrst.(p.22)

 •When“ManualInput”isselected,enteradesired9digitMMSIID

code for the individual you wish to call.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

About Manual Entry:

Enter a desired individual ID in the following way:

•SelectadesirednumberusingDial,or[Ω]/[≈].

•Push[ENT]orDialtosetit.

•Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

•Therstdigitisspeciedas‘0’foraGroupID.Ifa9digitGroupID

is entered, an error beep sounds when pushing [ENT] or dial.

•Thersttwodigitsare‘0’foranycoaststationID.

NOTE: When a coast station is selected in step w, the

voice channel is automatically speciﬁed by the coast sta-

tion. Therefore, skip step e and go directly to step r.

+ Continued on the next page.

DSC OPERATION

Select a desired intership channel using Dial or [ e Y]/[Z],

then push [ENT].

 •Intershipchannelsarealreadypresetintothetransceiverinthe

recommended order.

A conﬁrmation screen is displayed. r

 •Conrmthecallcontents.

Push [CALL] to make an Individual call. t

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

Standby on Channel 70 until an acknowledgement is re- y

ceived.

When the acknowledgement ‘Able to comply’ is received, u

alarm sounds and the screen below is displayed.

Push [ALARM OFF] to stop the alarm and then select the

intership channel speciﬁed in step e.

 •Adifferent intershipchannel willbeselected ifthe stationyou

called cannot use the channel.

 •Replyusingthemicrophone.Andgotostepi.

DSC OPERATION

■ Making DSC calls

Making an Individual call (continued) D

Or, when the acknowledgement ‘Unable to comply’ is re-

ceived, alarm sounds and the screen below is displayed.

Push [ALARM OFF] to stop the alarm. Then push [EXIT]

to return to the operating channel (before you entered the

MENU screen).

After communicating, push [EXIT] to return to the normal i

operating mode.

Tip ✓

When the optional MA-500TR

c l a s s b a i s t r a n s p o n d e r is

connected to your transceiver, you can make individual DSC

calls to selected AIS targets on the transponder without need-

ing to enter the target’s MMSI code.

See pages 67 and 68 for more details.

Making an Individual Acknowledgement

When you receive an Individual call, you can make an ac-

knowledgement (‘Able to Comply,’ ‘Propose New Channel,’ or

‘Unable to Comply’) by using the on-screen prompts. (Quick

ACK) Also, you can send an acknowledgement through the

MENU system. (Man ual ACK)

Quick ACK:

When an Individual call is received, alarm sounds and the q

screen below is displayed.

Push [ALARM OFF] to stop the alarm.

Push [ACK]. w

+ Continued on the next page.

DSC OPERATION

Select one of three options, then push [ENT]. e

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

 •AbletoComply:  Makeanacknowledgmentcallwithout

any changes.

 •UnabletoComply:  Youcannotmakeacommunication.

The Acknowledgement call (‘Unable to

Comply’) can be automatically trans-

mitted, if set. See page 63 for details.

 •ProposeNewChannel: You can make an acknowledgement

call, but you specify the intership chan-

nel. Select a desired intership chan-

nel, using Dial, or [Y]/[Z], then push

[ENT].

The Individual ACK conﬁrmation screen is displayed. r

Push [CALL] to make an acknowledgement call.

The screens shown below are displayed. t

Reply to the call using the microphone. y

Push [EXIT] to return to the normal operating mode. u

DSC OPERATION

■ Making DSC calls

Making an Individual Acknowledgement (continued) D

Manual ACK:

Enter “INDIVIDUAL ACK” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Individual ACK

(Push [MENU].)

(Rotate Dial, then push [ENT].)

 •WhennoIndividualcallhasbeenreceived,theIndividualACK

item will not be displayed.

Select a desired individual address or ID code to reply to, w

using Dial or [Y]/[Z], then push [ENT].

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

Do steps e e to u, as described in “Quick ACK:,” beginning

on the previous page.

Making a D Group call

The Group call function allows you to make a DSC signal to

only a speciﬁc group.

Enter “GROUP CALL” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Group Call

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Select a desired preset group address or “Manual Input,” w

using Dial or [Y]/[Z], then push Dial or [ENT].

 •TheIDcodefortheGroupcallcanbeenteredrst.(p.22)

 •When“ManualInput”isselected,enterthe8digitIDcodeforthe

group you wish to call.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

+ Continued on the next page.

DSC OPERATION

Select a desired intership channel using Dial or [ e Y]/[Z],

then push [ENT].

 •Intershipchannelsarealreadypresetintothetransceiverinthe

recommended order.

About Manual Entry:

Enter a desired group ID in the following way:

•SelectadesirednumberusingDial,or[Ω]/[≈].

•Push[ENT]orDialtosetit.

•Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

•Therstdigitisspeciedas‘0,’andtheseconddigitisotherthan

‘0’ for a Group ID.

•Thersttwodigitsare‘0’foranyCoaststationID.

A conﬁrmation screen r is displayed.

 •Conrmthecallcontents.

Push [CALL] to make a Group call. t

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

After the Group call has been transmitted, the following y

screen is displayed.

Announce the information using the microphone. u

After the announcement, push [EXIT] to return to the nor- i

mal operating mode.

DSC OPERATION

■ Making DSC calls (Continued)

D Making an All Ships call

All ships that have DSC transceiver use Channel 70 as their

‘listening channel.’ When you want to announce a message to

these ships, use the ‘All Ships Call’ function.

Enter “ALL SHIPS CALL” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ All Ships Call

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Select a desired category, using Dial or [ w Y]/[Z], then push

Dial or [ENT].

 •Theselectablecategorymaydiffer,dependingonthepresetting.

Ask your dealer for the selectable categories.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

Select a desired trafﬁc channel, using Dial or [ e Y]/[Z], then

push Dial or [ENT].

 •Theselectedchannelisdisplayed.

A conﬁrmation screen r is displayed.

 •Conrmthecallcontents.

Push [CALL] to make an All Ships call. t

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

After the All Ships call has been transmitted, the following y

screen is displayed.

Announce the message using the microphone. u

After the announcement, push [EXIT] to return to the nor- i

mal operating mode.

DSC OPERATION

D Making a Position Request Call

(For only U.S.A. and Australian version transceivers)

Make a Position Request Call when you want to know a spe-

ciﬁc ship’s current position, and so on.

Enter “POSITION REQUEST” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Position Request

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Select a desired preset individual address, or “Manual In- w

put,” using Dial or [Y]/[Z], then push Dial or [ENT].

 •TheIDcodeforthePositionRequestCallcanbeenteredrst.(p.

22)

 •When“ManualInput”isselected,enteradesired9digitMMSIID

code for the individual you wish to call.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

About Manual Entry:

Enter a desired individual ID in the following way:

•SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

•Push[ENT]orDialtosetit.

•Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

•Therstdigitisspeciedas‘0’foraGroupID.IfaGroupIDis

entered, an error beep sounds after pushing [FINISH].

•Thersttwodigitsare‘0’foranycoaststationID.

A conﬁrmation screen e is displayed.

 •Conrmthecallcontents.

DSC OPERATION

■ Making DSC calls

Making a Position Request call (continued) D

Push [CALL] to make a Position Request Call. r

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

After the Position Request Call has been transmitted, the t

following screen is displayed.

When the acknowledgement call is received, alarm sounds y

and the following screen is displayed.

Push [ALARM OFF] to stop the alarm, and then the screen u

as shown below is displayed.

Push [EXIT] to return to the normal operating mode. i

DSC OPERATION

D Making a Position Report Call

(For only U.S.A. and Australian version transceivers)

Make a Position Report Call when you want to announce your

own position to a speciﬁc ship and receive an answer back.

Enter “POSITION REPORT” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Position Report

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Select a desired preset individual address, or “Manual In- w

put,” using Dial or [Y]/[Z], then push Dial or [ENT].

 •TheIDcodefortheIndividualcallcanbeenteredrst.(p.22)

 •When“ManualInput”isselected,enteradesired9digitMMSIID

code for the individual you wish to call.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

About Manual Entry:

Enter a desired individual ID in the following way:

•SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

•Push[ENT]orDialtosetit.

•Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

•Therstdigitisspeciedas‘0’foraGroupID.IfaGroupIDis

entered, an error beep sounds after pushing [FINISH].

•Thersttwodigitsare‘0’foranycoaststationID.

A conﬁrmation screen e is displayed.

 •Conrmthecallcontents.

DSC OPERATION

■ Making DSC calls

Making a Position Report call (continued) D

Push [CALL] to make a Position Report Call. r

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

After the Position Report Call has been transmitted, the t

transceiver automatically returns to the normal operating

mode.

When no GPS receiver is connected and built-in GPS re-

ceiver* is not receiving valid position data, and both position

and time have been manually entered, the screen as shown

below is displayed. Edit your latitude and longitude position

and UTC time as follows:

*For only IC-M423G and IC-M424G.

Push [CHG], then edit your latitude and longitude position ➥

and UTC time.

 •SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •SelectN(Northlatitude)orS(Southlatitude)whenthecursor

is on the ‘N’ or ‘S’ position.

 •SelectW(Westlongitude)orE(Eastlongitude)whenthecur-

sor is on the ‘W’ or ‘E’ position.

DSC OPERATION

Making a D Polling Request Call

(For only U.S.A. and Australian version transceivers)

Make a Polling Request Call when you want to know a spe-

ciﬁc vessel is in the communication area, or not.

Enter “POLLING REQUEST” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Polling Request

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Select a desired preset individual address, or “Manual In- w

put,” using Dial or [Y]/[Z], then push Dial or [ENT].

 •TheIDcodefortheIndividualcallcanbeenteredrst.(p.22)

 •When“ManualInput”isselected,enteradesired9digitMMSIID

code for the individual you wish to call.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

About Manual Entry:

Enter a desired individual ID in the following way:

•SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

•Push[ENT]orDialtosetit.

•Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

•Therstdigitisspeciedas‘0’foraGroupID.IfaGroupIDis

entered, an error beep sounds after pushing [FINISH].

•Thersttwodigitsare‘0’foranycoaststationID.

A conﬁrmation screen e is displayed.

 •Conrmthecallcontents.

DSC OPERATION

■ Making DSC calls

Making a Polling Request call (continued) D

Push [CALL] to make a Polling Request Call. r

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

After the Polling Request Call has been transmitted, the t

following screen is displayed.

When the acknowledgement call is received, alarm sounds y

and the following screen is displayed.

Push [ALARM OFF] to stop the alarm, and then the screen u

as shown below is displayed.

Push [EXIT] to return to the normal operating mode. i

DSC OPERATION

D Making a Test call

Testing on the exclusive DSC distress and safety calling

channels should be avoided as much as possible. When test-

ing on a distress or safety channel is unavoidable, you should

indicate that these are test transmissions.

Normally the test call would require no further communica-

tions between the two stations involved.

Enter “TEST CALL” in the DSC CALLS menu. q

Select a desired preset individual address, or “Manual In- w

put,” then push Dial or [ENT].

 •TheIDcodefortheIndividualcallcanbeenteredrst.(p.22)

 •When“ManualInput”isselected,enterthe9digitMMSIIDcode

for the individual you wish to call.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

About Manual Entry:

Enter a desired address ID in the following way:

•SelectadesirednumberusingDial,or[Ω]/[≈].

•Push[ENT]orDialtosetit.

•Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

•Therstdigitisspeciedas‘0’foraGroupID.Ifa9digitGroupID

is entered, an error beep sounds when pushing [ENT] or dial.

•Thersttwodigitsare‘0’foranyCoaststationID.

A conﬁrmation screen is displayed. e

 •Conrmthecallcontents.

MENU

➪ DSC Calls ➪ Test Call

(Push [MENU].)

(Rotate Dial, then push [ENT].)

DSC OPERATION

■ Making DSC calls

Making a Test call (continued) D

Push [CALL] to make a Test call. r

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

After the Test call has been transmitted, the following t

screen is displayed.

When the acknowledgement call is received, alarm sounds y

and the following screen is displayed.

Push [ALARM OFF] to stop the alarm, and then the screen u

as shown below is displayed.

Push [EXIT] to return to the normal operating mode. i

DSC OPERATION

D Making a Test Acknowledgement call

When the “TEST ACK” in DSC settings is set to ‘Auto TX’

(p. 63), the transceiver automatically transmits a reply call

when a Test call is received.

Quick ACK:

When a Test call is received, alarm sounds and the screen q

shown below is displayed.

Push [ALARM OFF] to stop the alarm.

Push [ACK]. w

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[INFO]todisplaytheTestcallinformation.

About Received call information:

•Push[EXIT]toreturntothenormaloperatingmode.

•Push[BACK]toreturntothepreviousscreen.

•Push[ACK]togotothenextstep.

The Test ACK conﬁrmation screen is displayed. e

Push [CALL] to make an acknowledgement call.

While transmitting the acknowledgement call, the screen r

shown below is displayed, and then returns to the normal

operating mode.

DSC OPERATION

New2001

■ Making DSC calls

Making a Test Acknowledgement call (continued) D

Manual ACK:

Enter “TEST ACK” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Test ACK

(Push [MENU].)

(Rotate Dial, then push [ENT].)

 •IfnoTestcallhasbeenreceived,the“TESTACK”itemwillnot

be displayed.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

Select a desired Test call to reply to, using Dial or [ w Y]/[Z],

then push Dial or [ENT].

The Test ACK conﬁrmation screen is displayed. e

Push [CALL] to make an acknowledgement call.

While transmitting the acknowledgement call, the screen r

shown below is displayed, and then returns to the normal

operating mode.

DSC OPERATION

New2001

Making a D Position Reply call

Make a Position Reply call when a Position Request call is

received.

When the “POSITION ACK” in DSC Settings is set to ‘Auto

TX’ (p. 63), the transceiver automatically transmits a reply call

when a Position Request call is received.

Quick Reply:

When a Position Request call is received, alarm sounds q

and the screen shown below is displayed.

Push [ALARM OFF] to stop the alarm.

Push [ACK]. w

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[INFO]todisplaytheTestcallinformation.

About Received call information:

•Push[EXIT]toreturntothenormaloperatingmode.

•Push[BACK]toreturntothepreviousscreen.

•Push[ACK]togotothenextstep.

The Position Reply conﬁrmation screen is displayed. e

Push [CALL] to make a reply call.

While transmitting the reply call, the screen shown below r

is displayed, and then returns to the normal operating

mode.

DSC OPERATION

New2001

■ Making DSC calls

Making a Position Reply call (continued) D

Manual Reply:

Enter “POSITION REPLY” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Position Reply

(Push [MENU].)

(Rotate Dial, then push [ENT].)

 •IfnoPositionRequestcallisreceived,thePositionReplyitem

will not be displayed.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

Select a desired Position Request call to reply to, using w

Dial or [Y]/[Z], then push Dial or [ENT].

The Position Reply call conﬁrmation screen is displayed. e

Push [CALL] to make an acknowledgement call.

While transmitting the reply call, the screen shown below r

is displayed, and then returns to the normal operating

mode.

When no GPS receiver is connected and built-in GPS re-

ceiver* is not receiving valid position data, and both position

and time have been manually entered, the screen as shown

below is displayed. Edit your latitude and longitude position

and UTC time as follows:

*For only IC-M423G and IC-M424G.

Push [CHG], then edit your latitude and longitude position ➥

and UTC time.

 •SelectadesirednumberusingDial,or[Y]/[Z]/[Ω]/[≈].

 •Push[ENT]orDialtosetit.

 •Tomovethecursor,selecteitherarrow,“←” or “→,” then push

[ENT] or Dial.

 •SelectN(Northlatitude)orS(Southlatitude)whenthecursor

is on the ‘N’ or ‘S’ position.

 •SelectW(Westlongitude)orE(Eastlongitude)whenthecur-

sor is on the ‘W’ or ‘E’ position.

DSC OPERATION

New2001

Making a D Position Report Reply call

Make a Position Report Reply call when a Position Report

call is received.

Quick Reply:

When a Position Report call is received, alarm sounds and q

the screen as shown below is displayed.

Push [ALARM OFF] to stop the alarm.

Push [ACK]. w

•Push[EXIT]toreturntothenormaloperatingmode.

•Push[INFO]todisplaythePositionReportRequestcallinforma-

tion.

About Received call information:

•Push[EXIT]toreturntothenormaloperatingmode.

•Push[BACK]toreturntothepreviousscreen.

•Push[ACK]togotothenextstep.

The Position Report Reply conﬁrmation screen is dis- e

played.

Push [CALL] to make a reply call.

While transmitting the reply call, the screen shown below r

is displayed, and then returns to the normal operating

mode.

DSC OPERATION

New2001

■ Making DSC calls

Making a Position Report Reply call (continued) D

Manual Reply:

Enter “REPORT REPLY” in the DSC CALLS menu. q

 •IfnoPositionReportRequestcallisreceived,thePositionRe-

port Reply item will not be displayed.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

Select a desired Position Report Request call to reply to, w

using Dial or [Y]/[Z], then push Dial or [ENT].

The Position Report Reply call conﬁrmation screen is dis- e

played.

Push [CALL] to make an acknowledgement call.

While transmitting the reply call, the screen shown below r

is displayed, and then returns to the normal operating

mode.

MENU ➪ DSC Calls ➪ Position Report Reply

(Push [MENU].)

(Rotate Dial, then push [ENT].)

DSC OPERATION

New2001

Making a D Polling Request Reply call

Make a Polling Request Reply call when a Polling Request

call is received.

When the “POSITION ACK” in DSC Settings is set to ‘Auto

TX’ (p. 63), the transceiver automatically transmits a reply call

when receiving a Polling Request call.

Quick Reply:

When a Polling Request call is received, alarm sounds q

and the screen as shown below is displayed.

Push [ALARM OFF] to stop the alarm.

Push [ACK]. w

•Push[EXIT]toreturntothenormaloperatingmode.

•Push[INFO]todisplaythePollingRequestcallinformation.

About Received call information:

•Push[EXIT]toreturntothenormaloperatingmode.

•Push[BACK]toreturntothepreviousscreen.

•Push[ACK]togotothenextstep.

The Polling Request Reply conﬁrmation screen is dis- e

played.

Push [CALL] to make a reply call.

While transmitting the reply call, the screen shown below r

is displayed, and then returns to the normal operating

mode.

DSC OPERATION

New2001

■ Making DSC calls

Making a Polling Request Reply call (continued) D

Manual Reply:

Enter “POLLING REPLY” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Polling Reply

(Push [MENU].)

(Rotate Dial, then push [ENT].)

 •IfnoPollingRequestcallisreceived,thePollingReplyitemwill

not be displayed.

 •Push[EXIT]toreturntothenormaloperatingmode.

 •Push[BACK]toreturntothepreviousscreen.

Select a desired Polling Request call to be replied, using w

Dial or [Y]/[Z], then push Dial or [ENT].

The Polling Request Reply call conﬁrmation screen is dis- e

played. Push [CALL] to make an acknowledgement call.

While transmitting the reply call, the screen shown below r

is displayed, and then returns to the normal operating

mode.

DSC OPERATION

New2001

Receiving DSC calls ■

[Example]: Receiving a Distress Call.

When a Distress Call is received:

The emergency alarm sounds for 2 minutes. ➥

“RCVD DISTRESS” is displayed and the backlight blinks. ➥

[IGN]

Push to return to the normal operating mode. ➥

  •ThetransceiverexitstheDSCmode.

  •Bypushing[PTT],thetransceiveralsoexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

Push

Push [ALARM OFF] to q

stop the alarm and the

blinking backlight.

 •Even if you do not push

[ALARM OFF], the alarm

stops after 2 minutes, and

then the screen in step w

is displayed.

Push a softkey to select w

your desired action.

[INFO]

Push to display the Re- ➥

ceived call information.

(p. 61)

[ACPT]

Push to accept the call. ➥

And then, push [CH 16]

to change the operating

channel to Channel 16,

and then monitor it, as a

coast station may require

assistance.

 •Evenifyouhaven’tpushed

[CH 16] within 10 seconds,

the operating channel au-

tomatically changes to

Channel 16. (p. 64)

D Receiving a Distress Call/Distress Acknowledgement

DSC OPERATION

New2001 New2001

■ Receiving DSC calls (Continued)

[Example]: Receiving a Distress Relay call.

When a Distress Relay call is received:

The emergency alarm sounds for 2 minutes. ➥

“RCVD DISTRESS RELAY” is displayed and the backlight ➥

blinks.

[IGN]

Push to return to the normal operating mode. ➥

  •ThetransceiverexitstheDSCmode.

  •Bypushing[PTT],thetransceiveralsoexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

Push

D Receiving a Distress Relay Call/Distress Relay Acknowledgement

Push [ALARM OFF] to q

stop the alarm and the

blinking backlight.

 •Even if you do not push

[ALARM OFF], the alarm

stops after 2 minutes, and

then the screen in step w

is displayed.

Push a softkey to select w

your desired action.

[INFO]

Push to display the Re- ➥

ceived call information.

(p. 61)

[ACPT]

Push to accept the call. ➥

And then, push [CH 16]

to change the operating

channel to Channel 16,

and then monitor it, as a

coast station may require

assistance.

 •Evenifyouhaven’tpushed

[CH 16] within 10 seconds,

the operating channel au-

tomatically changes to

Channel 16. (p. 64)

New2001

DSC OPERATION

New2001

D Receiving an Individual Call

When an Individual Call is received:

➥ The alarm sounds for 2 minutes.

“RCVD INDIVIDUAL CALL” is displayed. The backlight may ➥

blink for 2 minutes, depending on the received Category.

Push [ALARM OFF] to stop the alarm and the blinking q

backlight.

 •Evenifyoudonotpush[ALARMOFF],thealarmstopsafter2

minutes, and then the screen in step w is displayed.

Push a softkey to select your desired action. w

[IGN]

➥

Push to ignore the Call and return to the normal operating

mode.

  •ThetransceiverexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

[INFO]

➥Push to display the Received call information. (p. 61)

[ACK]

Push to display the “INDIVIDUAL ACK” screen to reply ➥

to the Call. Select one of three options, depending on

your situation. See page 32 for details of the Individual

Acknowledgement procedures.

When “INDIVIDUAL ACK” is set to “Auto TX (Unable),” the

transceiver automatically replies to the Call. In that case,

both the TX and RX calls are stored in the Transmitted and

Received Call Logs.

DSC OPERATION

■ Receiving DSC calls (Continued)

When a Group Call, Geographical Area Call, or All Ships Call

is received:

The alarm sounds for 2 minutes. ➥

“RCVD GROUP CALL,” “RCVD GEOGRAPHICAL,” or ➥

“RCVD ALL SHIPS CALL” is displayed. The backlight may

blink for 2 minutes, depending on the received Category.

Push [ALARM OFF] to stop the alarm and the blinking q

backlight.

 •Evenifyoudonotpush[ALARMOFF],thealarmstopsafter2

minutes, and then the screen in step w is displayed.

Push a softkey to select your desired action. w

[IGN]

Push to ignore the Call and return to the normal operat- ➥

ing mode.

  •ThetransceiverexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

[INFO]

Push to display the Received call information. (p. 61) ➥

[ACPT]

Push to monitor the channel speciﬁed by the calling ➥

station for an announcement from the calling station.

Note for Geographical Area Call

When no GPS receiver is connected or if there is a prob-

lem with the external receiver, all Geographical Area Calls

are received, regardless of your position.

D Receiving a Group Call/Geographical Area Call/All Ships Call

DSC OPERATION

D Receiving a Position Request Call

When a Position Request Call is received:

➥ The alarm sounds for 2 minutes.

➥ “RCVD POS REQUEST” is displayed. The backlight blinks

for 2 minutes.

Push [ALARM OFF] to stop the alarm and the blinking q

backlight.

 •Evenifyoudonotpush[ALARMOFF],thealarmstopsafter2

minutes, and then the screen in step w is displayed.

Push a softkey to select your desired action. w

[IGN]

➥Push to ignore the Call and return to the normal operat-

ing mode.

  •ThetransceiverexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

[INFO]

➥Push to display the Received call information. (p. 61)

[ACK]

➥ Push to display the “POSITION REPLY” screen and

send a reply to the Call. (p. 47)

When “POSITION ACK” is set to “Auto TX,” the transceiver

automatically replies to the Call. In that case, both the TX

and RX calls are stored in the Transmitted and Received

Call Logs.

DSC OPERATION

■ Receiving DSC calls (Continued)

D Receiving a Position Report Call

When a Position Report Call is received:

➥ The alarm sounds for 2 minutes.

➥ “RCVD POSITION REPORT” is displayed. The backlight

blinks for 2 minutes.

Push [ALARM OFF] to stop the alarm and the blinking q

backlight.

 •Evenifyoudonotpush[ALARMOFF],thealarmstopsafter2

minutes, and then the screen in step w is displayed.

Push a softkey to select your desired action. w

[EXIT]

➥Push to ignore the Call and return to the normal operat-

ing mode.

  •ThetransceiverexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

[INFO]

➥Push to display the Received call information. (p. 61)

DSC OPERATION

D Receiving a Polling Request call/Test Call

[Example]: Receiving a Polling Request call.

When a Polling Request call is received:

The alarm sounds for 2 minutes. ➥

“RCVD POLLING REQUEST” is displayed. The backlight ➥

blinks for 2 minutes.

Push [ALARM OFF] to stop the alarm and the blinking q

backlight.

 •Evenifyoudonotpush[ALARMOFF],thealarmstopsafter2

minutes, and then the screen in step w is displayed.

Push a softkey to select your desired action. w

[IGN]

Push to ignore the Call and return to the normal operat- ➥

ing mode.

  •ThetransceiverexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

[INFO]

Push to display the Received call information. (p. 61) ➥

[ACK]

Push to display the “POLLING REPLY” screen to reply ➥

to the Call. (p. 51)

When “POSITION ACK” or “TEST ACK” is set to “Auto TX,”

the transceiver automatically replies to the Call. In that

case, both the TX and RX calls are stored in the Transmit-

ted and Received Call Logs.

DSC OPERATION

■ Receiving DSC calls (Continued)

D Receiving a Test Acknowledgement Call

When a Test Acknowledgement Call is received:

The alarm sounds for 2 minutes. ➥

“RCVD TEST ACK” is displayed. The backlight blinks for ➥

2 minutes.

Push [ALARM OFF] to stop the alarm and the blinking q

backlight.

 •Evenifyoudonotpush[ALARMOFF],thealarmstopsafter2

minutes, and then the screen in step w is displayed.

Push a softkey to select your desired action. w

[EXIT]

➥ Push to return to the normal operating mode.

  •ThetransceiverexitstheDSCmode.

  •“ ” continues to blink and the Call is stored in the Received

Call Log.

■ Transmitted Call log

The transceiver automatically stores up to 50 transmitted

calls, and the logs can be used as a supplement to your log-

book.

Enter “TX CALL LOG” in the DSC CALLS menu. q

MENU ➪ DSC Calls ➪ Transmitted Call Log

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Push [ w Y]/[Z] to select the desired item, then push [ENT].

 •Push[BACK]toreturntothepreviousscreen.

 •Push[EXIT]toreturntothenormaloperatingmode.

Rotate Dial to scroll the DSC message contents. e

Rotate

To delete the displayed DSC message, push [DEL]. r

 •Theconrmationscreenisdisplayed,thenpush[OK]todelete.

Push [EXIT] to return to the normal operating mode. t

DSC OPERATION

■ Received Call log

The transceiver automatically stores up to 50 distress mes-

sages and 50 other messages, and they can be used as a

supplement to your logbook.

•Whileinthenormaloperatingmode,“ ” blinks in the upper right

corner of the LCD when there is an unread DSC message.

Distress message D

Push [LOG] to enter “RCVD CALL LOG” in the DSC CALLS q

menu, or you can enter it through the Menu screen.

MENU ➪ DSC Calls ➪ Received Call Log

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Push [ w Y]/[Z] to select “Distress,” then push [ENT].

 •TheDistressmessagesarestoredin“Distress.”

 •“ ” is displayed when there are unread DSC messages.

 •“ ” is displayed when there are no unread DSC messages.

 •NoiconisdisplayedwhentherearenoDSCmessages.

 •Push[BACK]toreturntothepreviousscreen.

 •Push[EXIT]toreturntothenormaloperatingmode.

Push [ e Y]/[Z] to select the desired item, then push [ENT].

Rotate Dial to scroll the DSC message contents. r

Rotate

To delete the displayed DSC message, push [DEL]. t

 •Theconrmationscreenisdisplayed,thenpush[OK]todelete.

Push [EXIT] to return to the normal operating mode. y

DSC OPERATION

■ Received Call log (Continued)

Other messages D

Push [LOG] to enter “RCVD CALL LOG” in the DSC CALLS q

menu, or you can enter it through the Menu screen.

MENU ➪ DSC Calls ➪ Received Call Log

(Push [MENU].)

(Rotate Dial, then push [ENT].)

Push [ w Y]/[Z] to select “Others,” then push [ENT].

 •ThemessagesotherthantheDistressarestoredin“Others.”

 •“ ” is displayed when there are unread DSC messages.

 •“ ” is displayed when there are no unread DSC messages.

 •NoiconisdisplayedwhentherearenoDSCmessages.

 •Push[BACK]toreturntothepreviousscreen.

 •Push[EXIT]toreturntothenormaloperatingmode.

Push [ e Y]/[Z] to select the desired item, then push [ENT].

 •Themessageintheunopenedlehasnotbeenread.

Rotate Dial to scroll the DSC message contents. r

 •Thestoredmessagehasvariousinformation,dependingonthe

DSC call type.

Rotate

To delete the displayed DSC message, push [DEL]. t

 •Theconrmationscreenisdisplayed,thenpush[OK]todelete.

Push [EXIT] to return to the normal operating mode. y

DSC OPERATION

■ DSC Settings

D Position Entry (See page 25)

D Add Individual ID/Group ID (See pages 22, 23)

D Delete Individual ID/Group ID (See page 24)

D Automatic Acknowledgement

These items set the Automatic Acknowledgement function to

“Auto TX” or “Manual TX.”

When an Individual, Position Request, Polling Request, or

Test Call is received, the transceiver automatically transmits

an Individual Acknowledgement, Position Reply, Polling Re-

ply or Test Acknowledgement Call, respectively.

When “INDIVIDUAL ACK” is set to “Auto TX,” the trans-

ceiver automatically transmits the Acknowledgment call

including “Unable to Comply” (No Reason Given) after re-

ceivng the Individual call.

Enter either “INDIVIDUAL ACK,” “POSITION ACK” or “TEST

ACK” in the DSC Settings menu.

MENU ➪ DSC Settings ➪ 

Individual ACK



(Push [MENU].)

(Rotate Dial, then push [ENT].)

MENU ➪ DSC Settings ➪ 

Position ACK



MENU ➪ DSC Settings ➪ 

Test ACK



Rotate Dial w

to select “Auto TX” or “Manual TX,” then push

[ENT].

 •Push[BACK]tocancelandreturntotheDSCSettingsmenu.

(default)

Push [EXIT] to return to the normal operating mode. e

DSC OPERATION

■ DSC Settings (Continued)

D Channel 16 Switch function

By regulation, after receiving a Distress call, the transceiv-

er changes the operating channel to Channel 16. However,

when this setting is set to “OFF,” the function enables the

transceiver to remain on the operating channel, even after

receiving a Distress call.

q Enter “CH 16 SWITCH”

in the DSC Settings menu

MENU ➪ DSC Settings ➪ CH 16 Switch

(Push [MENU].)

(Rotate Dial, then push [ENT].)

w Rotate Dial or push [Y]/[Z] to set the Channel 16 Switch

function to “Auto (No Delay),” “10 Second Delay,” or “OFF,”

then push [ENT].

 •Push[BACK]toreturntothepreviousscreen.

(default)

Auto (No Delay): After receiving a Distress call, and

[ACPT] is pushed on the confirmation

screen, the transceiver immediately

changes to Channel 16.

10 Second Delay: After receiving a Distress call, and

[ACPT] is pushed on the confirmation

screen, the transceiver remains on the

current operating channel for 10 sec-

onds. After that, the transceiver auto-

matically changes to Channel 16.

(default)

OFF : Even after receiving a Distress call, the

transceiver remains on the operating

channel.

•“ ” is displayed.

Push [EXIT] to return to the normal operating mode. e

DSC OPERATION

D Alarm

Set the Alarm function ON or OFF, depending on the Cat-

egory or Status.

q Enter “ALARM”

in the DSC Settings menu

MENU ➪ DSC Settings ➪ Alarm

(Push [MENU].)

(Rotate Dial, then push [ENT].)

w Rotate Dial or push [Y]/[Z] to select the status, then push

[ENT].

 •Push[BACK]toreturntothepreviousscreen.

 •“Safety,”“Routine,”“Warning,”“Self-Terminate”and“Discrete”are

selectable. (default: ON )

Rotate Dial or push [ e Y]/[Z] to set the Alarm setting to “ON”

or “OFF.”

Push [EXIT] to return to the normal operating mode. r

D Channel 70 Squelch level

Set the squelch level on Channel 70.

The transceiver has 11 squelch levels between 1 (loose

squelch) and 10 (tight squelch) and OPEN.

OPEN is completely open.

q Enter “CH 70 SQL LEVEL”

in the DSC Settings menu

MENU ➪ DSC Settings ➪ CH 70 SQL Level

(Push [MENU].)

(Rotate Dial, then push [ENT].)

w Rotate Dial or push [Y]/[Z] to adjust the squelch level until

the noise just disappears, then push [ENT].

 •Push[BACK]tocancelandreturntotheDSCSettingsmenu.

(default)

Push [EXIT] to return to the normal operating mode. e

DSC OPERATION

■ DSC Settings (Continued)

D DSC Loop Test

The DSC loop test function sends transmit DSC signals to

the receive AF circuit to compare and check the TX and RX

signals at the AF level.

q Enter “DSC LOOP TEST”

in the DSC Settings menu

MENU ➪ DSC Settings ➪ DSC Loop Test

(Push [MENU].)

(Rotate Dial, then push [ENT].)

w Push [ENT] to start the DSC loop test.

 •Push[BACK]toreturntothepreviousscreen.

 •WhenthetransmitDSCandreceiveDSCsignalsmatch,“OK”is

displayed.

Push [EXIT] to return to the normal operating mode. e

If “NG” is displayed in step w, either or both TX and RX

DSC circuits has a problem. In that case, you will have to

send the transceiver to your nearest dealer for repair.

DSC OPERATION

When the optional MA-500TR CLASS B AIS TRANSPON-

DER is connected to your transceiver, an individual DSC call

can be transmitted to a selected AIS target, without needing

to enter the target’s MMSI code. In this case, the call type is

automatically set to Routine.

See page 83 for connecting instructions.

To ensure correct operation of the DSC function, make

sure you correctly set the CH70 SQL LEVEL. (p. 65)

Step 1: Transponder’s operation

Select a desired AIS target on the plotter, target list or dan- q

ger list display.

 •Youcanalsogotothenextstepwheneverthedetailscreenof

the AIS target is displayed.

 •Makesurethetransceiverisinthenormaloperatingmode.Oth-

erwise, you cannot make an individual DSC call using the tran-

sponder.

Push [DSC] to display the voice channel selection screen, w

and then push [Y] or [Z] to select a desired voice chan-

nel*.

 •Voicechannelsarealreadypresetintothetransponderinrecom-

mended order.

* When a coast station is selected in step q, a voice channel will

be speciﬁed by the coast station, therefore you cannot change

the channel. The transponder will display “Voice Channel is

speciﬁed by the Base station,” in this case.

Push [DSC] to make an individual DSC call to the AIS tar- e

get.

 •IfChannel70isbusy,thetransceiverstandsbyuntilthechannel

becomes clear.

 •Ifthetransceivercannotmakethecall,thetransponderwilldis-

play “DSC Transmission FAILED.”

Making an Individual call using an AIS transponder ■

Transponder’s display Transceiver’s display

DSC OPERATION

After making the individual DSC call, the transponder will r

display “DSC Transmission COMPLETED.”

 •Push[CLEAR]toreturntothescreendisplayedbeforeyouen-

tered the voice channel selection screen in step w.

 •ThetransceiverstandsbyonChannel70untilanacknowledge-

ment is received.

Step 2: Transceiver’s operation

When the acknowledgement is received, alarm sounds. t

If the acknowledgement ‘Able to comply’ is received, ➥

push [ALARM OFF] to stop the alarm, and then select

the intership channel speciﬁed in step w.

  •Adifferentintershipchannelwillbeselectedifthestationyou

called cannot use the channel.

  •Toreply,push[PTT]andspeakatyournormalvoicelevel.

  •YoucanchecktheMMSIcodeorthename,ifentered,ofthe

AIS target on the display.

If the acknowledgement ‘Unable to comply’ is received, ➥

push [ALARM OFF] to stop the alarm, and then “INDI-

VIDUAL CALL FAILED” is displayed.

After the communication is ﬁnished, push [EXIT] to return

to the normal operating mode.

Transponder’s display Transceiver’s display

[DSC]

[CLEAR]

[Z]

[Y]

TRANSPONDER

‘Able to comply’ is received

‘Unable to comply’ is received

■ Making an Individual call using an AIS transponder (Continued)

OTHER FUNCTIONS

New2001

Using the ■ Intercom

The optional Intercom function allows you to talk between the

radio and the where the Command microphone is located.

The optional HM-195

c o m m a n d m i c r o p h o n e is required for

Intercom operation.

Connect the HM-195

c o m m a n d m i c r o p h o n e as described on

page 87.

While using the intercom:

•Transmittingisdisabled.

•Receivedaudioismuted.

Hold down [PWR](Dial) to turn ON the power. q

 •The command microphone power is automatically turned ON,

even if the mic power is OFF.

Push [INCM] to enter the Intercom mode. w

Hold down [INCM CALL] to sound the intercom beeps. e

 •The transceiver and the command microphone sound beeps

while holding down [INCM CALL].

 •“CALL”isdisplayed.

After releasing [INCM CALL], hold down [PTT] and speak r

into the microphone at your normal voice level.

 •“TALK” is displayed on the caller’s display, and “LSTN” is dis-

played on the listener’s display.

 •

Rotate dial to adjust the transceiver’s intercom volume level.

 •Rotate[VOL/SQL](Dial)ontheHM-195toadjusttheHM-195’s

intercom volume level, .

After releasing [PTT], you can hear the response through t

the speaker.

Push [EXIT] to return to the normal operating mode.

While in the Intercom mode, the transmit and receive func-

tions are disabled. When the transceiver is transmitting,

the Intercom function is disabled.

On the caller’s display

On the listener’s display

OTHER FUNCTIONS

New2001

Using the ■ RX Speaker

The RX Speaker function enables you to hear the received

audio through a PA speaker.

Connect a PA speaker as described on page 82.

Push q

[RX

]

to enter the RX Speaker mode.

 •TheRXSpeakervolumeleveladjustmentscreenisdisplayed.

Rotate Dial or push [ w Y]/[Z]/[Ω]/[≈] to adjust the RX Speak-

er volume level, and then push [ENT].

 •“RX

” is displayed.

e Push

[RX ] to return to the normal operating mode.

 •“RX ” disappears.

To adjust the audio output level in the RX Speaker mode,

hold down

[RX

] for 1 second to display

the RX Speaker

volume level adjustment screen, and then rotate Dial. After

adjusting, push [ENT] to set it.

Using the ■ PA (Public Address)

The transceiver has a PA function to make announcements

through a PA speaker.

Connect a PA speaker rated at

more than 10 W at 10% distor-

tion with a 4 ˘ load,

as described on page 82.

•TransmittingisdisabledwhileinthePAmode.

Push [PA] to enter the Public Address mode. q

Hold down [PTT] and speak at your normal voice level. w

 •Whileholdingdown[PTT],thescreenbelowisdisplayed.

 •RotateDialor push [Y]/[Z]/[Ω]/[≈] to adjust the PA volume lev-

el.

Push [EXIT] to return to normal operating screen. e

While in the PA mode, the transmit and receive functions

are disabled. When the transceiver is transmitting, the PA

function is disabled.

OTHER FUNCTIONS

New2001

Using the ■ Horn

The Horn function sounds a horn.

Connect a PA speaker as described on page 82.

Push [HORN] to enter the Horn mode. q

Hold down [HORN] to sound a horn. w

 •Whileholdingdown[HORN],thehornsounds,andthescreen

below is displayed.

 •Rotate Dialor push [Y]/[Z]/[Ω]/[≈] to adjust the horn volume

level.

Push [EXIT] to return to the normal operating screen. e

While in the Horn mode, the transmit and receive functions

are disabled. When the transceiver is transmitting, the

Horn function is disabled.

New2001

MENU SCREEN OPERATION

■ Using the Menu screen

The Menu screen is used for entering infrequently changed

values, function settings or making DSC calls.

In addition to this page, see pages 73 through 81 for details.

Entering the Menu screen

Example: Set the channel group to “USA”

Push [MENU]. q

Rotate Dial or push [ w ∫]/[√] to select

the root item (Radio Settings), and

then push [ENT].

 •If[∫] or [√] is continuously held down,

the items are sequentially highlighted.

Rotate Dial or push [ e ∫]/[√] to se-

lect “CHAN Group,” and then push

[ENT].

Rotate Dial or push [ r ∫]/[√] to select

“USA,” and then push [ENT] to set it.

 •“✔” is displayed next to “USA.”

Push [EXIT] to exit the Menu screen.

 •Push [CLEAR] or [BACK] to return to

the previous screen.

[ENT][Y]/[Z]

[CLEAR][EXIT] [ENT][BACK] Dial

[MENU]

Menu lists

New2001

MENU SCREEN OPERATION

New2001

■ Menu screen items

The Menu screen contains the following items.

DSC Calls D

Item Ref. Item Ref.

•IndividualCall p. 30 •

Transmitted Call Log

p. 60

•IndividualACK*

p. 32

•PositionRequest

p. 37

•GroupCall p. 34

•

Position Report*

p. 40

•AllShipsCall p. 36 •PollingRequest*

p. 41

•DistressCall p. 26 •TestCall p. 43

•ReceivedCallLog p. 61 •TestACK*

p. 45

DSC Settings D

Item Ref. Item Ref.

•PositionInput*

p. 25 •TestACK p. 63

•IndividualID p. 22 •CH16Switch p. 64

•GroupID p. 23 •Alarm p. 65

•IndividualACK p. 63 •CH70SQLLevel p. 65

•PositionACK p. 63 •DSCLoopTest p. 66

Displayed only after receiving a corresponding call.

For only U.S.A and Australian version transceivers.

Displayed only when no GPS information is received.

Displayed only when the optional HM-195 is connected.

Radio Settings D

Item Ref. Item Ref.

•ScanType p. 74 •CHANGroup p. 74

•ScanTimer p. 74 •WXAlert*

p. 75

•Dual/Tri-Watch p. 74

Conﬁguration D

Item Ref. Item Ref.

•Backlight p. 76 •NoiseCancel p. 78

•DisplayContrast p. 76 •InactivityTimer p. 79

•KeyBeep p. 76 •NMEAOutput p. 80

•KeyAssignment p. 76 •RemoteID p. 81

•UTCOffset p. 78 •COMMANDMICSP*

p. 81

MMSI/GPS Info D

The transceiver shows the preset MMSI and ATIS*

codes

and GPS information*

If the code is not entered, “NO DSC MMSI” or “NO ATIS

MMSI”*

is displayed.

Displayed only for the Dutch and German version transceivers.

Displayed only when an external or the built-in GPS receiver is

receiving valid position data.

Rotate

MENU SCREEN OPERATION

New2001New2001

Radio Settings items ■

Scan type D

The transceiver has two scan types, Normal scan and Prior-

ity scan. A Normal scan searches all Favorite channels in the

selected channel group. A Priority scan sequentially searches

all Favorite channels, while monitoring Channel 16.

•Thedefaultsettingisdifferentdependingonthetransceiverver-

sions.

D Scan resume timer

The scan resume timer can be selected as a pause (OFF)

or timer scan (ON). When OFF is selected, the scan pauses

until the signal disappears. (Default: OFF)

• Priority scan

When ON is selected, the scan pauses for 5 sec-

onds and then resumes, even if a signal has been

received on any channel other than Channel 16.

• Normal scan When ON is selected, the scan pauses for 5

seconds and then resumes, even if a signal has

been received on any channel.

Dual/Tri-watch D

This item can be selected as Dualwatch or Tri-watch. (p. 21)

(Default: Dualwatch)

Channel Group D

Except for the European version, a channel group suitable

for your operating area can be selected. Depending on the

transceiver version, INT, USA, CAN, ATIS, or DSC may be

selectable.

See page 12 for details.

•ThescreenbelowshowstheU.S.Aversion.

MENU SCREEN OPERATION

New2001

D Weather alert

(For only U.S.A. and Australian version transceivers)

A NOAA broadcast station transmits a weather alert tone be-

fore important weather information.

After the transceiver detects the alert, “WX

” blinks until the

transceiver is operated.

•“WX ” displayed instead of “WX” when the function is set ON.

(Default: OFF)

ON with Scan: The preset weather channels are sequentially

checked while scanning.

ON: The previously selected (last used) weather

channel is checked while scanning.

OFF: The transceiver does not detect a weather

alert tone.

MENU SCREEN OPERATION

New2001

Conﬁguration items ■

Backlight D

The function display and keys can be backlit for better visibil-

ity under low light conditions.

The backlight can be set to 7 levels and OFF. (Default: 7)

D Display contrast

This item adjusts the contrast of the LCD in 8 steps.

Level 1 is the lowest contrast, and level 8 is the highest con-

trast. (Default: 5)

D Key Beep

You can turn OFF beep tones for silent operation, or you can

turn ON the tones to have conﬁrmation beeps sound when a

key is pushed. (Default: ON)

D Key Assignment

Desired functions can be assigned to Dial and the softkeys.

When the “KEY ASSIGNMENT” screen is displayed, rotate q

Dial or push [∫]/[√] to select “Dial” or “Softkeys,” and then

push [ENT].

Rotate Dial or push [ w ∫]/[√] to select the desired position,

and then push [ENT].

 •Toreturntothedefault,select“Setdefault”andpush[ENT].

For “Dial” assignment For “Softkeys” assignment

Rotate Dial or push [ e ∫]/[√] to select the option, and then

push [ENT] to set it.

 •“✔” is displayed next to the selected option.

For “Dial” assignment For “Softkeys” assignment*

* [CHAN] is displayed instead of [CH/WX] for the IC-M423 and

IC-M423G except for Australian version.

MENU SCREEN OPERATION

New2001

Push [EXIT] to exit the Menu screen. r

 •Push[CLEAR]or[BACK]toreturntothepreviousscreen.

• Dial assignment

The Audio volume (VOL), squelch (SQL), channel selection

(CHAN), and LCD backlight level (Backlight) functions can be

assigned to any one of 4 sequential positions on Dial. Push-

ing Dial 1 to 4 times sequentially selects the desired func-

tion, and rotating Dial adjusts the level or selects a value or

number.

For example:

- VOL is assigned the 1st position, and pushing Dial once

selects VOL. The VOL screen adjust screen is displayed and

rotating Dial adjusts the audio volume.

- CH is assigned to the 3rd position, and pushing Dial three

times selects CH. The channel number is displayed and ro-

tating Dial will select the desired channel.

You can assign VOL, SQL, CH/WX

* and Backlight to any one

of the 1st, 2nd, 3rd, or 4th sequential positions.

Repeatedly pushing Dial sequentially displays all the func-

tions in the order they are assigned, and skips any functions

assigned as Not Used.

* [CHAN] is displayed instead of [CH/WX] for the IC-M423 and IC-

M423G except for Australian version.

• Softkeys assignment

The desired function can be assigned as the softkey func-

tion. The assigned function can be used when its key icon is

displayed.

See page 3 through 4 for details of the assignable key func-

tions.

MENU SCREEN OPERATION

New2001

■ Conﬁguration items (Continued)

D UTC Offset

Set the offset time between the UTC (Universal Time Coordi-

nated) and your local time to between –14:00 and +14:00 (in

1 minute steps). (Default: 00:00)

D Noise Cancel

Set the Noise Cancel function for both receive and transmit.

When the “NOISE CANCEL” screen is displayed, rotate Dial

or push [∫]/[√] to select “RX” or “TX,” and then push [ENT].

Rotate Dial or push [ w ∫]/[√] to select the option, and then

push [ENT] to set it.

 •“✔” is displayed next to the selected option.

Push [EXIT] to exit the Menu screen. e

 •Push[CLEAR]or[BACK]toreturntothepreviousscreen.

• RX

Turn the receive Noise Cancel function ON or OFF.

OFF : Turns OFF the function. (Default)

1 : The Noise Cancel function reduces random noise com-

ponents in the received signal to approximately one

half.

2 : The Noise Cancel function reduces random noise com-

ponents in the received signal to approximately one

third.

3 : The Noise Cancel function reduces random noise com-

ponents in the received signal to approximately one

tenth.

• TX

Turn the transmit Noise Cancel function ON or OFF.

OFF : Turns OFF the function. (Default)

ON : The Noise Cancel function reduces random noise com-

ponents in the transmitted signal to one third.

MENU SCREEN OPERATION

New2001

D Inactivity Timer

Set the inactivity timer to between 1 and 10 minutes (in 1

minute steps) or OFF for a “Not DSC Related” item, and set

it to between 1 and 15 minutes (in 1 minute steps) or OFF

for a “DSC Related” item. The count down alarm sounds 10

seconds before the Inactive timer returns the current screen

to the normal operating screen.

When the “INACTIVITY TIMER” screen is displayed, rotate q

Dial or push [∫]/[√] to select “Not DSC Related” or “DSC

Related,” and then push [ENT].

Rotate Dial or push [ w ∫]/[√] to select the option, and then

push [ENT] to set it.

 •“✔” is displayed next to the selected option.

Push [EXIT] to exit the Menu screen. e

 •Push[CLEAR]or[BACK]toreturntothepreviousscreen.

• Not DSC Related

When the LCD displays a screen other than the normal opera-

tion screen, or one not related to the DSC, and no key opera-

tion occurs for this set period, the transceiver automatically

returns to the normal operating screen.

(Default: 10 min)

• DSC Related

When the LCD displays the screen related to DSC, and no key

operation occurs for this set period, the transceiver automatically

returns to the normal operating screen.

(Default: 15 min)

MENU SCREEN OPERATION

New2001

■ Conﬁguration items (Continued)

D NMEA Output

Select the Data Output function option for a NMEA output

port.

• POS data output (Default: OFF)

When receiving position data from an external or the built-in

GPS receiver,* this function sends the data from the NMEA

Output port to an external device.

*For only IC-M423G and IC-M424G.

• DSC data output (Default: OFF)

When receiving a DSC call, this function makes the trans-

ceiver send the DSC data from its NMEA Output port to an

external device.

All Stations: Outputs the call from any vessel from the

NMEA Output port.

Station List: Outputs the call from any vessels listed on

the Individual ID screen.

OFF: Does not output any call to an external de-

vice.

MENU SCREEN OPERATION

New2001

D Remote ID

Set a Remote ID number to between 1 and 69.

The Remote ID is included in the sentence of the Icom origi-

nal NMEA format. (Default: 15)

D COMMANDMIC Speaker

(Displayed only when the optional HM-195 is connected.)

The HM-195’s external speaker can be used instead of the

internal speaker. (Default: Internal Speaker)

•The“COMMANDMICSP”screenisdisplayedontheHM-195’sdis-

play. Not displayed on the transceiver’s display.

Internal Speaker : Turns ON the internal speaker. (Default)

External Speaker : Turns ON the external speaker.

Regardless of this setting, the supplied microphone’s

speaker is ON.

CONNECTIONS AND MAINTENANCE

■ Connections

q ANTENNA CONNECTOR

Connects to a marine VHF antenna cable’s PL-259 con-

nector.

CAUTION: Transmitting without an antenna may dam-

age the transceiver.

w NMEA IN/OUT LEADS

Brown: Talker B (Data-L), NMEA In (–)

White: Talker A (Data-H), NMEA In (+)

Connect to NMEA In lines of a PC or NMEA 0183 (ver. 2.0

or later) sentence format DSC, DSE compatible navigation

equipment, to receive position data from other ships.

Green: Listener B (Data-L), NMEA Out (–)

Yellow: Listener A (Data-H), NMEA Out (+)

Connect to NMEA Out lines of a GPS receiver for position-

data.

 •A NMEA 0183 ver. 2.0 or later RMC, GGA, GNS, GLL,VTG,

GSV, and GSA sentence format compatible GPS receiver is re-

quired. Ask your dealer about suitable GPS receivers.

e AF OUT LEADS

Blue: External Speaker (+)

Black: External Speaker (–)

Connects to an external speaker.

Orange: Public Address Speaker (+)

Gray: Public Address Speaker (–)

Connects to a PA speaker.

 •PAoutputpower:Morethan10Wat10%distortionintoa4˘ load

DO NOT connect the black or grey leads to the ground.

These leads must be connected to the External speaker

(–) or Public Address Speaker (–) lines.

NOTE for NMEA In/Out and AF Out leads:

The connectors are attached to keep the leads together.

Before connecting to a piece of equipment, you should cut

the leads to remove the connector.

CONNECTIONS AND MAINTENANCE

r DC POWER CONNECTOR

Connects to a 13.8 V DC power source.

CAUTION: After connecting the DC power cable, NMEA

leads, external speaker leads, and PA speaker leads, cov-

er the connector and leads with an vulcanizing tape, as

shown below, to prevent water seeping into the connec-

tion.

Rubber vulcanizing

tape

t GROUND TERMINAL

Connects to a vessel ground to prevent electrical shocks

and interference from other equipment occurring.

Use a PH M3 × 6 screw (user supplied).

y COMMAND MICROPHONE JACK

Connects to the optional Command microphone. (p. 87)

Connect to the MA-500TR D

Connect the transceiver to the high-density D-Sub 15-pin

connector of the MA-500TR using the OPC-2014* cable. Af-

ter connecting, an Individual DSC call can be made to the

AIS target using the transponder without entering the target’s

MMSI code.

* The OPC-2014 is supplied with the MA-500TR

• Listener A (Data-H) lead (Yellow):

Connects to lead 3 of the OPC-2014.

• Listener B (Data-L) lead (Green):

Connects to lead 2 of the OPC-2014.

• Talker A (Data-H) lead (White):

Connects to lead 5 of the OPC-2014.

• Talker B (Data-L) lead (Brown):

Connects to lead 4 of the OPC-2014.

CONNECTIONS AND MAINTENANCE

New2001

■ Antenna

A key element in the performance of any communication sys-

tem is the antenna. Ask your dealer about antennas and the

best place to mount them.

■ Fuse replacement

One fuse is installed in the supplied DC power cable. If the

fuse blows or the transceiver stops functioning, track down

the source of the problem, repair it, and replace the damaged

fuse with a new one of the proper rating.

Fuse rating: 10 A

■ Cleaning

If the transceiver becomes dusty or dirty, wipe it clean with a

soft, dry cloth.

DO NOT use harsh solvents such as benzine or

alcohol, as they will damage transceiver surfaces.

■ Supplied accessories

Mounting bracketFor mounting bracket

DC power cable

(OPC-891A)

Microphone hanger

and screws (3×16 mm)

Knob bolts

Screws (5×20 mm)

Flat washers (M5)

Spring washers (M5)

CONNECTIONS AND MAINTENANCE

New2001

■ Mounting the transceiver

Using the supplied mounting bracket D

The universal mounting bracket supplied with your transceiv-

er allows overhead or dashboard mounting.

Mount the bracket securely to a surface which is more than q

10 mm thick and can support more than 5 kg using the two

supplied screws (5 × 20 mm).

w Attach the transceiver to the bracket so that the face of the

transceiver is at 90° to your line of sight when operating it.

KEEP the transceiver and microphone at least 1 meter

away from the vessel’s magnetic navigation compass.

NOTE: Check the installation angle; the function display

may not be easy-to-read at some angles.

NOTE for the IC-M423G and IC-M424G:

Built-in GPS receiver is located at the right top of the front

panel.

If the transceiver is covered with any object that interrupts

the GPS signals from the satellites, the GPS receiver will

not calculate its position.

Therefore, when you use the built-in GPS receiver, be sure

the transceiver is positioned so the GPS receiver has a

clear view to receive signals from satellites.

• MOUNTING EXAMPLE

These bolts are shown as

only a mounting example.

(User supplied)

Built-in GPS receiver

is located here.

(For only IC-M423G

and IC-M424G.)

CONNECTIONS AND MAINTENANCE

■ MB-132 installation

An optional MB-132 f l u s h m o u n t is available for mounting the

transceiver to a ﬂat surface, such as an instrument panel.

KEEP the transceiver and microphone at least 1 meter

away from your vessel’s magnetic navigation compass.

Using the template on page 93, carefully cut a hole into q

the instrument panel, or wherever you plan to mount the

transceiver.

Slide the transceiver through the hole, as shown below. w

Attach the clamps on either side of the transceiver with two e

M5 × 8 mm supplied bolts.

 •Makesurethattheclampsalignparalleltothetransceiverbody.

Tighten the end bolts on the clamps (clockwise) so that the r

clamps press ﬁrmly against the inside of the instrument

control panel.

Tighten the locking nuts (counterclockwise) so that the trans- t

ceiver is securely mounted in position, as shown below.

Connect the antenna and power cable, then return the in- y

strument control panel to its original place.

CONNECTIONS AND MAINTENANCE

■ Microphone installation

The optional HM-195 should be connected to the transceiver

using the supplied OPC-1540 connection cable.

The cable is used to operate from a longer distance. The

cable connector can also be installed as a built-in plug on a

cabinet or wall.

To operate from even longer distances, the optional 6 meter

long OPC-1541 extension cable can be used between the

transceiver and the OPC-1540. Up to two OPC-1541 can be

added.

Installation D

Insert the OPC-1540 cable connector into the command q

microphone jack, and tighten the nut.

To use the cable connector as a wall socket, install it as w

described to the right.

Using the mounting base as a template, carefully mark the e

holes where the cable and three screws will be fastened.

Drill holes at these marks. r

Install the mounting base using the supplied screws, as t

shown below.

Gasket

Cap

Mounting base Nut

Screw holes

(approx. 2 (d) mm;

⁄32˝)

The completed installation should look like this. y

CONNECTIONS AND MAINTENANCE

Gasket

Mounting base

Cap

Nut

SPECIFICATIONS AND OPTIONS

All stated speciﬁcations are subject to change without notice or obligation.

■ Speciﬁcations

General D

Frequency coverage:•

Tx IC-M423/IC-M423G 156.000–161.450 MHz

IC-M424/IC-M424G 156.025–157.425 MHz

IC-M423 (CHN version) 156.025–157.425 MHz

Rx IC-M423/IC-M423G 156.000–163.425 MHz

IC-M424/IC-M424G 156.050–163.275 MHz

IC-M423 (CHN version) 156.050–162.025 MHz

CH70 156.525 MHz

Mode: 16K0G3E (FM) •

16K0G2B (DSC)

Channel spacing: 25 kHz•

Operating temperature range: –20°C to +60°C;•

–4ºF to +140ºF

Current drain (at 13.8 V):•

TX high 5.5 A maximum

Maximum audio 5.0 A maximum

Power requirement:•

(negative ground) 13.8 V DC nominal

Frequency stability: ±1.5 kHz (–20°C to +60°C;•

–4°F to +140°F)

Antenna impedance: 50 • Ω nominal

Dimensions (approximately): 180(W) × 82(H) × 135(D) mm•

; 7.1(W) × 3.2(H) × 5.3(D) inches

(Projections not included)

Weight (approximately): 1.2 kg; 2.6 lb•

Transmitter D

Output power: 25 W/1 W•

Modulation system: Variable reactance frequency •

modulation

•Maximumfrequencydeviation:±5.0kHz

Spurious emissions: •

IC-M423/IC-M423G Less than 0.25 µW

IC-M424/IC-M424G Less than –70 dBc (high)

Less than –56 dBc (low)

Receiver D

Receive system: Double conversion superheterodyne•

Sensitivity:•

FM IC-M423/IC-M423G –5 dBµ emf typical (at 20 dB SINAD)

IC-M424/IC-M424G –13 dBµ typical (at 12 dB SINAD)

DSC IC-M423/IC-M423G –4 dBµ emf typical (1% BER)

IC-M424/IC-M424G –5 dBµ emf typical (1% BER)

Squelch sensitivity: •

IC-M423/IC-M423G Less than –2 dBµ emf

IC-M424/IC-M424G Less than –10 dBµ

Intermodulation rejection ratio:•

FM IC-M423/IC-M423G More than 68 dB

IC-M424/IC-M424G More than 70 dB

DSC More than 68 dBµ emf (1% BER)

Spurious response rejection ratio:•

FM More than 70 dB

DSC More than 73 dBµ emf (1% BER)

Adjacent channel selectivity:•

FM More than 70 dB

DSC More than 73 dBµ emf (1% BER)

Audio output power: •

IC-M423/IC-M423G More than 10 W at 10% distortion

into a 4 Ω load

IC-M424/IC-M424G 10 W at 10% distortion into a 4 Ω

load

New2001

SPECIFICATIONS AND OPTIONS

New2001

Dimensions D

■ Options

•MB-132 f l u s h m o u n t k i t

To mount the transceiver to a panel.

•MA-500TR

c l a s s b a i s t r a n s p o n d e r

To transmit individual DSC calls to a selected AIS targets.

•HM-195

c o m m a n d m i c IV™

External microphone-type controller. Provides optional in-

tercom operation. 6 m (20 ft) microphone cable and mount-

ing base included. Black and white colors are available.

HM-195B: Black

HM-195SW: Super White

•OPC-1541

m i c r o p h o n e e x t e n s i o n c a b l e

6 m (20 ft) microphone extension cable for optional HM-195

c o m m a n d m i c IV™. Up to two OPC-1541 can be connected.

Usable length is 18 m (60 ft) maximum.

Approved Icom optional equipment is designed for optimal perfor-

mance when used with an Icom transceiver.

Icom is not responsible for the destruction or damage to an Icom

transceiver in the event the Icom transceiver is used with equipment

that is not manufactured or approved by Icom.

82 (3.2) 119.9 (4.7)

164.1 (6.5)

25.3

(1)

109.7 (4.3)

61.4 (2.4)

Unit: mm (inch)

180 (7.1)

CHANNEL LIST

New2001

NOTE: Simplex channels, 3, 21, 23, 61, 64, 81, 82, and 83 CANNOT

be lawfully used by the general public in U.S.A. waters.

Low power only.*

Momentary high power.

DSC operation only.

UK Marina Channels: M1=37A (157.850 MHz), M2=P4 (161.425 MHz)

for only U.K. versions.

For only U.S.A versions.*

For only U.S.A, U.K, and Australian versions.

For only U.S.A and Australian versions.

Channel number Frequency (MHz)

03 156.150 160.75003

03A 156.150 156.150

156.200 160.80004

02 156.100 160.70002

04A 156.200 156.200

156.250 160.85005

05A 05A 156.250 156.250

06 06 156.300 156.30006

156.350 160.95007

07A 07A 156.350 156.350

08 08 156.400 156.40008

09 09 156.450 156.45009

10 10 156.500 156.50010

11 11 156.550 156.55011

12 12 156.600 156.60012

13*

156.650 156.650

14 14

156.700 156.700

15*

156.750 156.750

15*

16 16

156.800 156.800

17*

156.850 156.850

156.900 161.500

18A 18A

156.900 156.900

156.950 161.550

19A 19A 156.950 156.950

20 20*

157.000 161.60020

20A 157.000 157.000

01A 156.050 156.050

USA*

156.050 160.65001

CAN

Transmit Receive

INT

Channel number Frequency (MHz)

157.100 161.70022

22A 22A 157.100 157.100

23 157.150 161.75023

21b Rx only 161.650

23A 157.150 157.150

24 24 157.200 161.80024

25 25 157.250 161.85025

25b Rx only 161.850

26 26 157.300 161.90026

27 27 157.350 161.95027

28 28 157.400 162.00028

28b Rx only 162.000

60 156.025 160.62560

156.075 160.67561

61A 61A 156.075 156.075

156.125 160.72562

62A 156.125 156.125

156.175 160.77563

63A 156.175 156.175

64 156.225 160.82564

64A 64A 156.225 156.225

156.275 160.87565

65A 65A 156.275 156.27565A*

156.325 160.92566

66A 66A*

156.325 156.32566A*

67*

67 156.375 156.37567

21A 21A 157.050 157.050

USA*

21 157.050 161.65021

CAN

Transmit Receive

INT

Channel number Frequency (MHz)

71 71 156.575 156.57571

72 72 156.625 156.62572

73 73 156.675 156.67573

70*

156.525 156.52570*

74 74 156.725 156.72574

75*

156.775 156.77575*

76*

156.825 156.82576*

77*

156.875 156.87577

156.925 161.52578

78A 78A 156.925 156.925

156.975 161.57579

79A 79A 156.975 156.975

157.025 161.62580

80A 80A 157.025 157.025

157.075 161.67581

81A 81A 157.075 157.075

157.125 161.72582

82A 82A 157.125 157.125

83 157.175 161.77583

83A 83A 157.175 157.175

83b Rx only 161.775

84 84 157.225 161.82584

84A 157.225 157.225

85 85 157.275 161.87585

85A 157.275 157.275

86 86 157.325 161.92586

69 69 156.475 156.47569

USA*

68 156.425 156.42568

CAN

Transmit Receive

INT

Channel number Frequency (MHz)

88 88 157.425 162.02588

88A 157.425 157.425

87A 157.375 157.375

87 87 157.375 161.97587

86A

USA*

157.325 157.325

CAN

Transmit Receive

INT

Frequency (MHz)

RX only 162.425

RX only 162.450

RX only 162.500

RX only 162.475

RX only 162.525

RX only 161.650

RX only 161.775

RX only 163.275

RX only 162.400

RX only 162.550

Transmit Receive

WX channel*

37A*

157.850 157.85037A*

P4*

161.425 161.425P4*

New2001

TROUBLESHOOTING

PROBLEM POSSIBLE CAUSE SOLUTION REF.

The transceiver does

not turn ON.

•Badconnectiontothepowersource. •Checktheconnectiontothetransceiverand

power source.

p. 82

Little or no sound comes

from the speaker.

•Squelchlevelissettoohigh.

•Volumelevelissettoolow.

•Speakerhasbeenexposedtowater.

•Setthesquelchtothethresholdpoint.

•Setthevolumetoasuitablelevel.

•RemovethewaterwiththeAquaQuakefunc-

tion.

p. 15

p. 18

Transmitting is impossi-

ble, or high power can-

not be selected

•Somechannelsarerestrictedtolowpower

or receive only by regulations.

•Theoutputpowerissettolow.

•Changechannels.

•Push[HI/LO]toselecthighpower.

pp. 11,

12, 13

p. 14

Scan does not start. •Favoritechannelsarenotentered. •Setthedesired channels asFavoritechan-

nels.

p. 20

No beep sounds. •BeeptonesareturnedOFF. •TurnONthebeeptonesintheCONFIGURA-

TION menu.

p. 76

Distress calls cannot be

transmitted.

•MMSI(DSCselfID)codeisnotentered. •EntertheMMSI(DSCselfID)code. p. 9

Built-in GPS receiver is

not receiving valid posi-

tion data.

( For only IC-M423G

and IC-M424G.)

•Thebuilt-inGPSantennaiscoveredbyan

object that interrupts the GPS signals from

the satellites.

•Mount the transceiver in a place where no

objects interrupts the satellites signal.

p. 85

Cut here

Unit: mm (inch)

R12 (Max.)

29.5 to 31.5 (d)

⁄

to 1

⁄

)

180 (7

⁄

)

82 (3

⁄

)

165.1 (6

⁄

)

62.4 (2

⁄

)

MB-132

HM-195

2 (

⁄

)

TEMPLATE

INDEX

New2001

Accessories, supplied .........................................................84

Acknowledgement, Automatic ............................................63

Alarm ................................................................................65

All Ships call

Making a call ...................................................................36

Receiving a Call ..............................................................56

Antenna ..............................................................................84

AquaQuake .........................................................................18

ATIS code ...........................................................................10

Backlight level .....................................................................18

Call channel

Selecting a Call channel .................................................11

Entering a Call channel ..................................................16

Call log

Received Call log ............................................................61

Transmitted Call log ........................................................60

Channel 16 .........................................................................11

Channel 16 Switch function ................................................64

Channel 70 Squelch level ...................................................65

Channel group ....................................................................12

Channel List ........................................................................91

Channel Name ....................................................................16

Cleaning .............................................................................84

COMMANDMIC Speaker ....................................................81

Connections ........................................................................82

Country Code List ................................................................. ii

Display contrast ..................................................................76

Distress Acknowledgement ................................................53

Distress Call

Making a call ..................................................................26

Canceling a call ..............................................................29

Receiving a Call .............................................................53

Distress Relay Acknowledgement ......................................54

Distress Relay Call .............................................................54

DSC Loop Test ....................................................................66

DSC Settings ......................................................................63

DUALWATCH/TRI-WATCH .................................................21

Explicit Deﬁnitions ................................................................. i

Favorite channels ...............................................................20

Front panel............................................................................2

Function display ....................................................................5

Fuse replacement ...............................................................84

INDEX

New2001New2001

Geographical Area Call ......................................................56

Group call

Making a call ...................................................................34

Receiving a Call ..............................................................56

Group ID

Entering ID .....................................................................23

Deleting ID ......................................................................24

Horn ................................................................................71

IMPORTANT ..........................................................................i

Inactivity Timer....................................................................79

Individual Call

Making a call ...................................................................30

Making an acknowledgement ........................................32

Receiving a call ..............................................................55

Individual ID

Entering ID .....................................................................22

Deleting ID ......................................................................24

Intercom ..............................................................................69

Installation

Template .........................................................................93

Key Assignment ..................................................................76

Key Beep ............................................................................76

MB-132 installation .............................................................86

Menu screen

Menu screen items ........................................................73

Using the Menu screen ..................................................72

Microphone installation .......................................................87

Microphone Lock function ...................................................17

MMSI code ...........................................................................9

Mounting the transceiver ....................................................85

NMEA Output .....................................................................80

Noise Cancel ......................................................................78

Operating Rules ....................................................................1

Operation, basic .................................................................11

Options ...............................................................................90

INDEX

New2001

PA (Public Address) ............................................................70

Polling Request Call

Making a call ..................................................................41

Making a reply call .........................................................51

Receiving a call ..............................................................59

Position and time ................................................................25

Position Report Call

Making a call ..................................................................39

Making a reply call .........................................................49

Receiving a call ..............................................................58

Position Request Call

Making a call ..................................................................37

Making a reply call .........................................................47

Receiving a call ..............................................................57

PRECAUTIONS (English) .................................................... vi

PRÉCAUTIONS (Français) ................................................. vii

Receiving ............................................................................14

Remote ID ..........................................................................81

RX Speaker ........................................................................70

Scan

Scan resume timer .........................................................74

Scan types .....................................................................19

Starting a scan ...............................................................20

Softkey function ....................................................................7

Speciﬁcations .....................................................................89

Speaker Microphone ............................................................8

Squelch ...............................................................................15

Test Acknowledgement call

Making a call ..................................................................45

Receiving a call ..............................................................60

Test call

Making a call ..................................................................43

Making an acknowledgement .........................................45

Receiving a call ..............................................................59

Transmitting ........................................................................14

Troubleshooting ..................................................................92

UTC Offset ..........................................................................78

volume ................................................................................15

Weather alert ......................................................................75

Weather channel ................................................................13

1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan

A-7197D-1EX

Printed in Japan

Printed on recycled paper with soy ink.

< Intended Country of Use >

Icom iM424 Handleiding

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