583795
122
Verklein
Vergroot
Pagina terug
1/134
Pagina verder
owner’s
manual
and
reference
guide
chartplotting receiver
& depth-fi nder
GPSMAP 188/188C/238 Sounder
(GPSMAP 188C Shown)
188Ccover.indd 1 6/30/2003, 3:24:39 PM
© Copyright 2003 Garmin Ltd. or its subsidiaries
Garmin International, Inc.
1200 East 151
st
Street, Olathe, KS 66062, U.S.A.
Tel. 913/397.8200 or 800/800.1020 Fax 913/397.8282
Garmin (Europe) Ltd.
Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey SO51 9DL, U.K.
Tel. 44/1794.519944 Fax 44/1794.519222
Garmin Corporation
No. 68, Jangshu 2
nd
Road, Shijr, Taipei County, Taiwan
Tel. 886/2.2642.9199 Fax 886/2.2642.9099
All Rights Reserved. Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted, disseminated, downloaded or
stored in any storage medium, for any purpose without prior written consent of Garmin. Garmin hereby grants permission to download a single copy of this
manual and of any revision of this manual onto a hard drive or other electronic storage medium to be viewed and to print one copy of this manual or any
revision hereto, provided that such electronic or printed copy of this manual or revision must contain the complete text of this copyright notice and provided
further that any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
Information in this manual is subject to change without notice. Garmin reserves the right to change or improve its products and to make changes in the con-
tent without obligation to notify any person or organization of such changes. Visit the Garmin web site (www.garmin.com) for current updates and supple-
mental information concerning the use and operation of this and other Garmin products.
GARMIN
®
, AutoLocate
®
, GPSMAP
®
, See-Thru
®
, DCG (Depth Control Gain)
®
, MapSource
®
, BlueChart
®
, and TracBack
®
are registered trademarks of Garmin
Ltd. or its subsidiaries and may not be used without the express permission of Garmin.
June 2003 Part Number 190-00216-10 Rev. A Printed in Taiwan
188Ccover.indd 2 6/30/2003, 3:24:52 PM
i
Introduction
Preface and
Registration
)
Preface
Congratulations on choosing one of the most advanced marine navigation systems available! The
Garmin GPSMAP
®
188/188C/238 Sounders utilize the proven performance of Garmin GPS and full fea-
tured mapping to create an unsurpassed marine navigation chartplotters.
This manual covers instructions for the GPSMAP 188, GPSMAP 188C (color), and GPSMAP 232.
Unit operation and specifi cations will be the same on all three models, unless otherwise speci-
ed. To get the most out of your new navigation system, take the time to go through this owner’s manual
and learn the operating procedures for your unit. This manual is broken down into two parts for your
convenience.
Part One introduces you to the GPSMAP 188/188C/238 Sounder and provides a Getting Started tour
so that you may become more familiar with the unit. This section will provide you with a basic working
knowledge necessary to use the unit to its fullest potential.
Part Two is divided into sections that provide detailed references to the advanced features and opera-
tions of the GPSMAP 188/188C/238 Sounder. This allows you to concentrate on a specifi c topic quickly
and look up detailed information about the GPSMAP 188/188C/238 Sounder.
Customer Service Product Registration
Help us better support you by completing our on-line registration today!
Have the serial number of your GPSMAP 188/188C/238 handy and connect to our web site
(www.garmin.com). Look for the Product Registration link on the Home page. Also, be sure to record
your serial number in the area provided on page iv of this manual.
NOTE: If you have previously registered a Garmin product purchase, we invite you to
re-register using our NEW on-line system. Many services provided by our new product
registration system are now being automated and re-registering your purchase ensures
you the best possible support from Garmin.
188188C238 Manual Intro.indd i 6/30/2003, 3:26:06 PM
ii
Introduction
FCC Compliance
FCC Compliance
The GPSMAP 188/188C/238 Sounder complies with Part 15 of the FCC interference limits for Class
B digital devices FOR HOME OR OFFICE USE. These limits are designed to provide more reason-
able protection against harmful interference in a residential installation, and are more stringent than
“outdoor” requirements.
Operation of this device is subject to the following conditions: (1) This device may not cause harmful
interference, and (2) this device must accept any interference received, including interference that may
cause undesired operation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or and experienced radio/TV technician for help.
The GPS 188C Sounder does not contain any user-serviceable parts. Repairs should only be made by
an authorized Garmin service center. Unauthorized repairs or modifi cations could result in permanent
damage to the equipment, and void your warranty and your authority to operated this device under
Part 15 regulations.
188188C238 Manual Intro.indd ii 6/30/2003, 3:26:26 PM
iii
Introduction
Warnings and Cautions
The GPS system is operated by the United States government, which is solely responsible for its accuracy
and maintenance. The system is subject to changes which could affect the accuracy and performance of all GPS
equipment. Although the Garmin GPSMAP 188/188C/238 is a precision electronic NAVigation AID (NAVAID),
any NAVAID can be misused or misinterpreted and, therefore, become unsafe.
The electronic chart is an aid to navigation and is designed to facilitate the use of authorized government
charts, not replace them. Only offi cial government charts and notices to mariners contain all information needed
for safe navigation – and, as always, the user is responsible for their prudent use.
Use the GPSMAP 188/188C/238 at your own risk. To reduce the risk of unsafe operation, carefully review
and understand all aspects of this Owner’s Manual—and thoroughly practice operation using the simulator
mode prior to actual use. When in actual use, carefully compare indications from the GPSMAP 188/188C/238 to
all available navigation sources, including the information from other NAVAIDs, visual sightings, charts, etc. For
safety, always resolve any discrepancies before continuing navigation.
FCC Compliance
The GPSMAP 188/188C/238 complies with Part 15 of the FCC interference limits for Class B digital devices
FOR HOME OR OFFICE USE. These limits are designed to provide reasonable protection against harmful
interference in a residential installation, and are more stringent than “outdoor” requirements. Operation of this
device is subject to the following conditions: (1) This device may not cause harmful interference, and (2) this
device must accept any interference received, including interference that may cause undesired operation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the
receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an
outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced
radio/TV technician for help.
The GPSMAP 188/188C/238 does not contain any user-serviceable parts. Repairs should only be made by
an authorized Garmin service center. Unauthorized repairs or modifi cations could result in permanent damage
to the equipment, and void your warranty and your authority to operate this device under Part 15 regulations.
CAUTION: IT IS THE USER’S RESPONSIBILITY TO
USE THIS PRODUCT PRUDENTLY. THIS PRODUCT IS
INTENDED TO BE USED ONLY AS A NAVIGATIONAL
AID AND MUST NOT BE USED FOR ANY PURPOSE
REQUIRING PRECISE MEASUREMENT OF DIREC-
TION, DISTANCE, LOCATION, OR TOPOGRAPHY.
,
MAP DATA INFORMATION: One of the goals of
Garmin is to provide customers with the most complete and
accurate cartography that is available to us at a reasonable
cost. We use a combination of governmental and private
data sources, which we identify (as required) in product lit-
erature and copyright messages displayed to the consumer.
Virtually all data sources contain inaccurate or incomplete
data to some degree. This is particularly true outside the
United States, where complete and accurate digital data is
either not available or prohibitively expensive.
WARNING: This product, its packaging, and its compo-
nents contain chemicals known to the State of California
to cause cancer, birth defects, or reproductive harm. This
Notice is being provided in accordance with California’s
Proposition 65. If you have any questions or would like
additional information, please refer to our web site at http:
//www.garmin.com/prop65.
188188C238 Manual Intro.indd iii 6/30/2003, 3:26:29 PM
iv
Introduction
Warranty and
Serial Number
The GPSMAP 188/188C/238 Sounder is fastened shut with
screws. Any attempt to open the case to change or modify
the unit in any way will void your warranty and may result
in permanent damage to the equipment.
,
Serial Number
Use this area to record the serial number (8-digit number
located on the back of the unit) in case it is lost, stolen, or
needs service. Be sure to keep your original sales receipt in a
safe place or attach a photocopy inside the manual.
Serial Number:
*
*
LIMITED WARRANTY
This Garmin product is warranted to be free from defects in materials or workmanship for one year from
the date of purchase. Within this period, Garmin will at its sole option, repair or replace any components
that fail in normal use. Such repairs or replacement will be made at no charge to the customer for parts or
labor, provided that the customer shall be responsible for any transportation cost. This warranty does not
cover failures due to abuse, misuse, accident or unauthorized alteration or repairs.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL
OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY LIABILITY ARISING
UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, STATU-
TORY OR OTHERWISE. THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, WHICH MAY VARY
FROM STATE TO STATE.
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR INABILITY TO
USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do not allow the exclusion of
incidental or consequential damages, so the above limitations may not apply to you.
Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the
purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE REMEDY
FOR ANY BREACH OF WARRANTY.
To obtain warranty service, contact your local Garmin authorized dealer. Or call Garmin Customer Ser-
vice at one of the numbers shown below, for shipping instructions and an RMA tracking number. The unit
should be securely packed with the tracking number clearly written on the outside of the package. The unit
should then be sent, freight charges prepaid, to any Garmin warranty service station. A copy of the original
sales receipt is required as the proof of purchase for warranty repairs.
Products sold through online auctions are not eligible for rebates or other special offers from Garmin.
Online auction confi rmations are not accepted for warranty verifi cation. To obtain warranty service, an
original or copy of the sales receipt from the original retailer is required. Garmin will not replace missing
components from any package purchased through an online auction.
Garmin International, Inc. Garmin (Europe) Ltd.
1200 East 151st Street Unit 4, The Quadrangle, Abbey Park Industrial Estate
Olathe, Kansas 66062, U.S.A. Romsey, SO51 9DL, U.K.
Phone: 913/397.8200 Phone: 44/1794.519944
USA Only: 800/800.1020 FAX: 44/1794.519222
FAX: 913/397.0836
188188C238 Manual Intro.indd iv 6/30/2003, 3:26:29 PM
v
Introduction
Software License Agreement
Software License Agreement
BY USING THE GPSMAP 188/188C/238, YOU AGREE TO BE BOUND BY THE TERMS AND CON-
DITIONS OF THE FOLLOWING SOFTWARE LICENSE AGREEMENT. PLEASE READ THIS AGREE-
MENT CAREFULLY.
Garmin grants you a limited license to use the software embedded in this device (the “Software”) in
binary executable form in the normal operation of the product. Title, ownership rights and intellectual
property rights in and to the Software remain in Garmin.
You acknowledge that the Software is the property of Garmin and is protected under the United
States of America copyright laws and international copyright treaties. You further acknowledge that the
structure, organization and code of the Software are valuable trade secrets of Garmin and that the Software
in source code form remains a valuable trade secret of Garmin. You agree not to decompile, disassemble,
modify, reverse assemble, reverse engineer or reduce to human readable form the Software or any part
thereof or create any derivative works based on the Software. You agree not to export or re-export the
Software to any country in violation of the export control laws of the United States of America.
188188C238 Manual Intro.indd v 6/30/2003, 3:26:29 PM
,
GPSMAP 188/188C/238 Sounder
Standard and Optional Transducers
Unit part numbers 010-00268-01, 010-00239-02, 010-
00239-03, and 010-00250-11 include a 200/50kHz, 10/40
degree, plastic, depth and temp, transom mount transducer.
For a complete list of optional transducers, see page 96.
For the most recent list of available accessories for
your GPS unit, current user manuals and software
updates, visit our web site at www.garmin.com.
vi
Packing List
Introduction
Before installing and getting started with your unit, please check to see that your package includes
the following items. If any parts are missing, please contact your Garmin dealer immediately.
Standard Package:
GPSMAP 188/188C/238 Sounder Unit
GA 29 External Antenna and 30’ cable
Gimbal Mount and Knobs
Power/Data Cable
Owner’s Manual
Quick Reference Card
Protective Cover
Optional Accessories:
US A/C PC Adapter
EURO A/C PC Adapter
Cigarette Lighter Adapter
BlueChart Marine Data Cards, MapSource CDs, USB Data Card Programmer and Data Cards
USB Data Card Programmer
GBR21 Beacon Receiver for differential corrections; GA 22 H-Field Antenna
2nd Mounting Station
Marine Swivel Mount, 1” RAM
®
Mount (GPSMAP 188 with external antenna only)
188188C238 Manual Intro.indd vi 6/30/2003, 3:26:30 PM
vii
Introduction
Capabilities
Designed for detailed electronic charting capability, the Garmin GPSMAP 188/188C/238 Sounder is
a powerful navigation device that can give you the information you need:
Precision Performance
188C: High-contrast, 16-color LCD screen with backlighting; 188/238: High-contrast, ten-level
gray, LCD screen with backlighting
12-channel parallel receiver tracks and uses up to 12 satellites for fast, accurate positioning
WAAS Capable — receive signals from the additional set of WAAS (Wide Area Augmentation
System) satellites to give you better accuracy
Differential-Ready — just add an optional Garmin beacon receiver for better than 5-meter accu-
racy
Fully gasketed, high-impact plastic alloy case, waterproof to IEC 529 IPX7
Advanced Navigating and Plotting
3000 alphanumeric waypoints with selectable icons and comments
Built-in Worldwide marine basemap to 20 miles includes detailed ocean, river and lake coast-
lines, cities, interstates, US state highways, and local thoroughfares
50 reversible routes with up to 254 (188C; 50 on 188/238) waypoints each
Uploadable maps using Garmin’s MapSource™ PC products and BlueChart™ Data Cards
Coordinates: Lat/Lon, UTM/UPS, Loran TD, plus over 20 grids, including Maidenhead
TracBack route feature which allows you to quickly retrace your track log to a starting position
Built-in simulator mode
Built-in tide information from over 3,000 tide stations around the USA coastline, Alaska,
Hawaii, western Canada and several Caribbean Islands
Superior Fishfi nding Ability
Whiteline feature provides a clear image of both bottom hardness and structure
See-Thru
®
technology which helps separate fi sh returns from thermoclines and structure
Four zoom levels with a moving view window
Underwater waypoint marking
Map/Sonar split screen combines navigation and fi shfi nding information
Fish and depth alarms
188188C238 Manual Intro.indd vii 6/30/2003, 3:26:30 PM
viii
Introduction
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . i-viii
Preface and Registration . . . . . . . . . . . . . . . . . . i
FCC Compliance . . . . . . . . . . . . . . . . . . . . . . .ii
Warnings and Cautions . . . . . . . . . . . . . . . . . iii
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
Software License Agreement . . . . . . . . . . . . . . .v
Packing List . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Table of Contents . . . . . . . . . . . . . . . . . . . . . viii
Section One: Getting Started . . . . . . . . . . . . 1-21
Keypad Usage . . . . . . . . . . . . . . . . . . . . . . . . . .1
Initializing the Receiver . . . . . . . . . . . . . . . . . .2
Selecting Options & Entering Data . . . . . . . . . .4
Backlighting . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Simulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Map Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Going to a Destination . . . . . . . . . . . . . . . . . .11
Sonar Page . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Compass Page . . . . . . . . . . . . . . . . . . . . . . . .16
Numbers Page . . . . . . . . . . . . . . . . . . . . . . . .16
Highway Page . . . . . . . . . . . . . . . . . . . . . . . . .17
Active Route Page . . . . . . . . . . . . . . . . . . . . . .19
Main Menu Page . . . . . . . . . . . . . . . . . . . . . . .20
Section Two: Reference . . . . . . . . . . . . . . . . 22-77
Map Page . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Using the Cursor . . . . . . . . . . . . . . . . . . .22
Selecting Map Scales . . . . . . . . . . . . . . . . .24
Map Page Options . . . . . . . . . . . . . . . . . .25
Sonar Page . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Using the Adjustment Menu . . . . . . . . . . .33
Sonar Page Options . . . . . . . . . . . . . . . . .36
Compass Page . . . . . . . . . . . . . . . . . . . . . . . .41
Numbers Page . . . . . . . . . . . . . . . . . . . . . . . .42
Highway Page . . . . . . . . . . . . . . . . . . . . . . . . .42
Waypoints . . . . . . . . . . . . . . . . . . . . . . . . . . .44
Creating . . . . . . . . . . . . . . . . . . . . . . . . . .44
Reviewing and Editing . . . . . . . . . . . . . . .48
Going to a Destination . . . . . . . . . . . . . . . . . .53
Go To . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
TracBack . . . . . . . . . . . . . . . . . . . . . . . . . .54
MOB Key . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
Creating . . . . . . . . . . . . . . . . . . . . . . . . . .57
Following . . . . . . . . . . . . . . . . . . . . . . . . .58
Route List Page . . . . . . . . . . . . . . . . . . . . .59
Route Review Page . . . . . . . . . . . . . . . . . .60
Active Route Page . . . . . . . . . . . . . . . . . . . . . .64
Find Key . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Main Menu Page . . . . . . . . . . . . . . . . . . . . . . .67
GPS Tab . . . . . . . . . . . . . . . . . . . . . . . . . .68
Tide Tab . . . . . . . . . . . . . . . . . . . . . . . . . .72
Trip Tab . . . . . . . . . . . . . . . . . . . . . . . . . .74
Celestial Tab . . . . . . . . . . . . . . . . . . . . . . .74
Track Tab . . . . . . . . . . . . . . . . . . . . . . . . .75
DSC Tab . . . . . . . . . . . . . . . . . . . . . . . . . .77
Card Tab . . . . . . . . . . . . . . . . . . . . . . . . . .82
Time Tab . . . . . . . . . . . . . . . . . . . . . . . . .82
Pages Tab . . . . . . . . . . . . . . . . . . . . . . . . .83
Temp Tab . . . . . . . . . . . . . . . . . . . . . . . . .84
System Tab . . . . . . . . . . . . . . . . . . . . . . . .84
Units Tab . . . . . . . . . . . . . . . . . . . . . . . . .85
Communication Tab . . . . . . . . . . . . . . . . .87
Alarm Tab . . . . . . . . . . . . . . . . . . . . . . . . .90
Appendices . . . . . . . . . . . . . . . . . . . . . . . . 92-121
Appendix A: Installation . . . . . . . . . . . . . . . . .92
Appendix B: Data Cards . . . . . . . . . . . . . . . .100
Appendix C: Maintenance . . . . . . . . . . . . . .101
Appendix D: Loran TD . . . . . . . . . . . . . . . . .102
Appendix E: Map Datum . . . . . . . . . . . . . . .104
Appendix F: Messages . . . . . . . . . . . . . . . . .106
Appendix G: Navigation Terms . . . . . . . . . . .108
Appendix H: Time Offsets . . . . . . . . . . . . . .110
Appendix I: Understanding Sonar . . . . . . . .111
Appendix J: Specifi cations . . . . . . . . . . . . . .116
Appendix K: Index . . . . . . . . . . . . . . . . . . . .118
188188C238 Manual Intro.indd viii 6/30/2003, 3:26:30 PM
1
Getting Started
Keypad Usage
Using the Keypad
ZOOM IN Key— adjusts the map scale to display a smaller area with more detail (Zooms in).
ZOOM OUT Key— adjusts the map scale to display a larger area with less detail (Zooms out).
NAV Key— displays the Go To and Follow navigation menu.
PAGE Key— selects the main pages in sequence and returns display from a submenu page.
QUIT Key— returns the display to the previous page and, when entering data, it restores the previous
value (cancels data entry).
MENU Key— displays a menu of available options for the current page. Press twice to display the
Main Menu.
ARROW KEYPAD— used to select (Highlight) menu options and enter data. It also controls cursor
movement on the Map Page.
FIND Key— activates the fi nd function to search for nearby items and user waypoints.
ENTER/MARK Key— selects a highlighted menu option. When entering data, it allows you to initiate
entry, and then to accept the selected value(s). It also marks the current location as a waypoint when
pressed and held for more than one second.
MOB (Man OverBoard) Key— activates the Man OverBoard navigation feature when pressed.
POWER/BACKLIGHT/CONTRAST Key— turns the unit on/off and adjusts display illumination.
Also controls Contrast on monochrome units.
NOTE: Always press and release a key to perform its primary function. Pressing and
holding the ENTER/MARK key will activate its secondary function.
)
IN
ZOOM
OUT
ZOOM
NAV
PAG E
QUIT
MENU
MOB
MARK
ENTER
FIND
188188C238 Manual Part 1.indd 1 6/30/2003, 3:34:14 PM
3
Getting Started
Initializing the Receiver
To graphically initialize the GPSMAP 188/188C/238 Sounder:
1. Press the MENU key twice for the Main Menu. Press Up or Down on the ARROW KEYPAD until
the ‘GPS’ tab is highlighted, then press the MENU key once.
2. Using the ARROW KEYPAD, highlight ‘Initialize Position’ and press ENTER to initialize the
receiver from the map. The Initialize Position Page appears, prompting you to select your
approximate location with the map cursor.
3. Use the ARROW KEYPAD to move the map cursor and point to your approximate location within
200 miles. If you have diffi culty identifying your position, press and release the IN key to see the
next lower map scale.
4. Once you have determined your approximate location on the map, press the ENTER key.
NOTE: This does not “calibrate” the unit in any way, but rather helps to speed up the
initial satellite acquisition. If the unit displays “Ready (2D) or (3D )” during this
process, it is not necessary to initialize the unit.
The GPSMAP 188/188C/238 Sounder will now begin searching for the appropriate satellites for
your region and should acquire a fi x within a few minutes. When viewing the ‘GPS’ tab on the Main
Menu, a signal strength bar for each satellite in view appears on the bottom of the page, with the
appropriate satellite number under each bar. The progress of satellite acquisition is shown in three
stages:
No signal strength bars— the receiver is looking for the satellites indicated.
Hollow signal strength bars— the receiver has found the indicated satellites and is collecting data.
Solid signal strength bars— the receiver has collected the necessary data and the satellites are ready
for use.
Once the receiver has collected information from at least three satellites, the top of the screen
displays either “Ready (2D or 3D)”, and the GPSMAP 188/188C/238 Sounder is ready for use.
Point to your approximate
location and press
ENTER/MARK.
A satellite’s strength bars
turn green when it’s ready
for use.
,
188188C238 Manual Part 1.indd 3 6/30/2003, 3:34:20 PM
112
Appendix I
Transducer Coverage
Transducer Coverage
The area covered by the transmitted sound waves is determined by the cone angle of the transducer
and the water depth. Cone angles may vary between different types of transducers. For example, a
50kHz frequency may provide a “wide” 40° cone angle, with a coverage width that is approximately
2/3 of the water depth. As shown in the sidebar, the 40° cone angle (50kHz frequency) approximately
covers the area of a 20 foot diameter circle at a 30 foot depth. A 200kHz frequency may provide a
“narrow” 10° cone angle, with a coverage width that is approximately 2/10 of the water depth. As
shown, the 10° cone angle (200kHz frequency) approximately covers the area of a 6 foot diameter
circle at a 30 foot depth.
When using the GPSMAP 188/188C/238 in ‘Dual’ frequency mode, the unit transmits both 50kHz and
200kHz signals at the same time. The ‘Dual’ frequency capability of the GPSMAP 188/188C/238 allows
you to have a large coverage area and still retain good bottom resolution. When in ‘Dual’ frequency
mode the unit uses the narrow cone angle (200kHz) to display detailed bottom information, keeping
“Dead Zones” to a minimum, and the wide cone angle (50kHz) for the large coverage area.
Fish returns from the wide and narrow beams appears differently on the display. The wide beam tends
to show longer fi sh returns than the narrow beam.
Wide Cone Angle
Narrow Cone Angle
200kHz - 10˚ Cone Angle
72" coverage at 30'
50kHz - 40˚ Cone Angle
20' coverage at 30'
188188C238 Manual Part 2.indd 112 6/30/2003, 3:32:56 PM
122

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