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8X22Astron GPS Solar World-Time
Complete User Guide
CONTENTSREAD FIRST
1
ASTRON 8X22 GPS SOLAR          
1
Length adjustment service for metallic bands is available at the retailer from whom
the watch was purchased. If you cannot have your watch repaired by the retailer
from whom the watch was purchased because you received the watch as a gift,
or you moved to a distant place, please contact SEIKO WORLDWIDE SERVICE
NETWORK. The service may also be available on a chargeable basis at other
retailers, however, some retailers may not undertake the service.
If your watch has a protective film for preventing scratches, make sure to peel it off
before using the watch. If the watch is used with the film on it, dirt, sweat, dust, or
moisture may be attached under the film and may cause rust.
For proper and safe use of your SEIKO watch,
please read carefully the instructions in this
Complete User Guide before using it.
2
ASTRON 8X22 GPS SOLAR          
READ FIRST
1
HANDLING CAUTIONS
WARNING
To indicate the risks of serious consequences such as severe injuries
unless the following safety regulations are strictly observed.
Keep the watch and accessories out of the reach of babies and children.
Care should be taken to prevent a baby or a child accidentally swallowing the
accessories.
If a baby or child swallows the battery or accessories, immediately consult a doctor,
as it will be harmful to the health of the baby or child.
Immediately stop wearing the watch in the following cases.
{If the watch body or band becomes edged by corrosion etc.
{If the pins protrude from the band.
½Immediately consult the retailer from whom the watch was purchased or SEIKO
WORLDWIDE SERVICE NETWORK.
Do not remove the secondary battery from the watch.
½About the secondary battery Power Source P. 3 8
Replacement of the secondary battery requires professional knowledge and skill.
Please ask the retailer from whom the watch was purchased for replacement of
the secondary battery.
Installation of an ordinary silver oxide battery can generate heat that can cause
bursting and ignition.
Avoid wearing or storing the watch in the following places.
{Places where volatile agents (cosmetics
such as polish remover, bug repellent,
thinners etc.) are vaporizing
{Places where the temperature drops below
5 ºC or rises above 35 ºC for a long time
(41 ºF and 95 ºF)
{Places of high humidity
{Places affected by strong
magnetism or static electricity
{Dusty places
{Places affected by strong vibrations
CAUTIONS
If you observe any allergic symptoms or skin irritation
Stop wearing the watch immediately and consult a specialist such as a dermatologist
or an allergist.
Other cautions
{Replacement of the metal band requires professional knowledge and skill. Please
ask the retailer from whom the watch was purchased for replacement of the metal
band, as there is a risk of hand or finger injury and fear of losing parts.
{Do not disassemble or tamper with the watch.
{Keep the watch out of the reach of babies and children. Extra care should be taken
to avoid risks of any injury or allergic rash or itching that may be caused when they
touch the watch.
{When disposing of used batteries, follow the instructions of your local authorities.
{If your watch is of the fob or pendant type, the strap or chain attached to the watch
may damage your clothes, or injure the hand, neck, or other parts of your body.
{Please keep in mind that if a watch is taken off and placed down as it is, the case
back, the band and the clasp will rub against each other possibly causing scratches
on the case back. We recommend placing a soft cloth between the case back, the
band and the clasp after taking off your watch.
To indicate the risks of light injuries or material damages unless the
following safety regulations are strictly observed.
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ASTRON 8X22 GPS SOLAR          
READ FIRST
1
CAUTIONS
Do not turn or pull out the crown when the
watch is wet.
Water may get inside of the watch.
½
If the inner surface of the glass is clouded with condensation
or water droplets appear inside of the watch for a long time,
the water resistant performance of the watch is deteriorated.
Immediately consult the retailer from whom the watch was
purchased or SEIKO WORLDWIDE SERVICE NETWORK.
Do not wear the watch while taking a bath or
a sauna.
Steam, soap or some components of a hot spring
may accelerate the deterioration of water resistant
performance of the watch.
Do not leave moisture, sweat and dirt on the
watch for a long time.
Be aware of a risk that a water resistant watch may
lessen its water resistant performance because of
deterioration of the adhesive on the glass or gasket, or
the development of rust on stainless steel.
WARNING
Do not use the watch for scuba diving or
saturation diving.
The various tightened inspections under simulated harsh
environment, which are usually required for watches
designed for scuba diving or saturation diving, have
not been conducted on the water-resistant watch with
the BAR (barometric pressure) display. For diving, use
watches specifically designed for diving.
Do not pour running water directly from faucet.
The water pressure of tap water from a faucet is high
enough to degrade the water resistant performance of a
water resistant watch for everyday life.
CAUTIONS
GPS signal reception Solar charging function Automatic time adjustment function
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ASTRON 8X22 GPS SOLAR          
READ FIRST
1
This is a GPS solar watch.
This watch has the following features.
Features
This watch can be set to the precise local time
anywhere in the world by pushing just one
button.
 DST (Daylight Saving Time) can be set manually.
This watch quickly adjusts the time by receiving GPS
signals from GPS satellites.
Place where GPS signals can be easily received/
cannot be received P. 16
This watch responds to a total of 40 time zones around
the world
Time Zone P. 6
When the region or time zone where the watch is used
is changed, please carry out operation oftime zone
adjustment.
How to adjust the time zone P. 18
This watch operates by solar charging.
Expose the dial to light to charge the watch.
Once fully charged, the watch runs for approximately
6 months.
When the energy stored in the watch runs out
completely, it takes time to fully charge the watch, so
please keep in mind to charge the watch regularly.
How to charge the watch P. 14
Standard charging time P. 14
This watch automatically adjusts the time in
accordance with action patterns during use.
When the watch has sensed sufficient brightness under
an open sky, it automatically receives GPS signals
from GPS satellites. This function enables the watch to
automatically adjust the time precisely even while you
are using the watch.
Automatic time adjustment P. 25
 This watch is unable to receive GPS signals when the energy
stored in the watch is low.
Check the Charging Status P. 13
Unlike navigation equipment, this GPS solar watch is not designed to constantly receive GPS signals from GPS satellites without any operation.
This watch receives GPS signals only in the time zone adjustment mode, automatic or manual time adjustment mode.
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ASTRON 8X22 GPS SOLAR          
READ FIRST
1
Mechanism by which the GPS solar watch sets time and date
What GPS is
GPS stands for Global Positioning System, a satellite positioning system
for determining the current position on the earth.
24 satellites cover the earth, and at present, the system is operated by
approximately 30 GPS satellites.
Wherever you are in the world, the position can be determined
(positioned) by information from more than 4 GPS satellites.
Mechanism by which this watch sets the time
and date
This watch receives GPS signals from GPS satellites to set the
time and date based on the following information.
GPS satellite
This is a satellite operated by the United States
Department of Defense (official name is NAVSTAR), and
orbits the earth at an altitude of 20,000 km.
Initially, this was a military satellite, but at present,
information is partially disclosed to the public and used in
various equipment including car navigation systems and
cellular phones.
The GPS satellite is mounted with a high-accuracy atomic
clock with an accuracy deviation of 1 second per 100,000
years.
Precise time and date based on the atomic clock
Information about a time zone where you are
(The current location is basically positioned by more
than 4 GPS satellites, and which zone of the total of 40
time zones around the world you are in is identified.)
To receive information about a time zone where you
are, it is necessary to adjust the time zone.
How to adjust the time zone P. 1 8
Unlike navigation equipment, this GPS solar watch is
not designed to constantly receive GPS signals from
GPS satellites without any operation.
This watch receives GPS signals from GPS satellites
only in the time zone adjustment mode, automatic or
manual time adjustment mode.
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ASTRON 8X22 GPS SOLAR          
READ FIRST
1
Time zone
Time zone
Based on Coordinated Universal Time (UTC), the standard time commonly used is adopted by countries and regions around the world.
The standard time is determined by each country or region, and the region where the same standard time is adopted is referred to as the time
zone, and presently, the time zone is divided into 40 zones as of March 2015.
DST (Daylight Saving Time)
Depending on the area, DST (Daylight Saving Time) is individually set.
Daylight Saving Time means summer time, which is a system to lengthen daylight time by advancing 1 hour when daylight time is long in
summer.
Daylight saving time has been adopted in about 80 countries, mainly in Europe and North America. The adoption and duration of daylight
saving time vary depending on the country.
Daylight Saving Time is subject to change owing to circumstances of the country or region.
Coordinated Universal Time (UTC)
UTC is the universal standard time coordinated through an international agreement. This is used as the official time for recording time around
the world. The time obtained by adding a leap second to the “International Atomic Time (TAI)” determined based on the atomic clock around
the world and coordinated in order to compensate for deviations from universal time (UT) which is astronomically determined is the UTC.
7
ASTRON 8X22 GPS SOLAR          
READ FIRST
1
The following functions are included
When the region or time zone where the watch is used is
changed
Adjust the time zone.
The watch displays the precise local time.
Time zone adjustment P. 17
Time Zone P. 6
Time zone display and list of time zones around the world P. 12
To set only the time
The watch displays the precise time of the time zone that is set by
operation of “manual time adjustment.
How to manually adjust the time P. 24
Check the time zone and DST (Daylight Saving Time) setting P. 20
Los Angeles 7:00 pm on 6th
London
3:00 am on 7th
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ASTRON 8X22 GPS SOLAR          
READ FIRST
1
How to check when the time zone information was configured for your watch
The case back shows the caliber-case number of your watch. By referring to caliber-case number shown on the case back, you will be able to determine
when the time zone data was configured.
For more details, refer to the URL below.
http://www.seikowatches.com/gpstimezonedatainfo/
If the official time zone has changed in a region after the watchs time zone data was
configured, the correct time will not be displayed even after receiving GPS signals. Please
perform the following operations to display the correct time:
To set the time of this watch in a region where the official time zone has changed
1. Select the time zone appropriate for the current time in the target region by manual time
zone setting.
For details, please refer to “Manual time zone setting” P. 22.
2. Next, adjust the time by manual time adjustment.
For details, please refer to “Manual time adjustment” P. 23.
3. When using the watch within the same time zone, the correct time will be displayed after
automatic (GPS) or manual time adjustments.
4. When moving from a region where the official time zone has changed to a different time
zone, then back to the region where the official time zone has changed, carry out the
same operations from 1. - 3. as indicated above to display the correct time in the region
where the official time zone has changed.
Caliber-case number
The number to identify
the watch type
Display may vary depending on the model.
8
X
2
2
-
0
A
A
0
-
2
8
X
2
2
-
0
A
A
0
-
2
9
ASTRON 8X22 GPS SOLAR          
CONTENTS
2
CONTENTS
1. READ FIRST .................................................................................................... 2
2. CONTENTS ..................................................................................................... 9
3. BEFORE USE ................................................................................................ 10
Names of the parts ..................................................................................... 10
Indicator hand display and reception result display ............................... 11
Time zone display and list of time zones around the world ................... 12
Check the charging status .......................................................................... 13
About charging ........................................................................................... 14
4. BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE
GPS SIGNALS, ETC.) .................................................................................. 15
Basic operation flow .................................................................................. 15
Place where GPS signals can be easily received/Place where GPS
signals cannot be received ........................................................................ 16
When the region or time zone where the watch is used is changed
(Time Zone Adjustment) ............................................................................ 17
Set DST (Daylight Saving Time) ................................................................ 19
Check the time zone and DST (Daylight Saving Time) settings .............. 20
When boarding (in-flight mode ( )).......................................................... 21
To set the watch to the local time of the destination in an airplane,
etc. (Manual time zone setting) ................................................................. 22
To set only the time (manual time adjustment) ....................................... 23
Automatic time adjustment ....................................................................... 25
GPS signal reception .................................................................................. 26
Leap second (Automatic leap second reception function) ..................... 27
Check that reception was successful (reception result display) ............. 28
Check the leap second data reception was successful ............................ 29
5. IN CASE OF AN UNUSUAL MOVEMENT OF THE SECOND
HAND ............................................................................................................. 30
Second hand movement and watch state (energy depletion
forewarning function) ................................................................................ 30
6. TO PRESERVE THE QUALITY OF YOUR WATCH ................................... 32
Daily care .................................................................................................... 32
Performance and caliber / case number ................................................... 32
Water resistance ......................................................................................... 33
Magnetic resistance (Magnetic influence) ............................................... 35
Band ............................................................................................................ 35
How to use an adjustable three-fold clasp ............................................... 36
Lumibrite ..................................................................................................... 37
Power Source .............................................................................................. 38
After-sale service ........................................................................................ 39
7. TROUBLESHOOTING ................................................................................. 40
When the watch is unable to receive GPS signals .................................. 40
When the date, indicator hand or hour/minute/second hand
position is misaligned ................................................................................ 42
Cancel the light detection .......................................................................... 46
Troubleshooting ......................................................................................... 47
8. FUNCTION LIST/SPECIFICATIONS ......................................................... 53
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ASTRON 8X22 GPS SOLAR          
BEFORE USE
3
Names of the parts
Display of city name may vary depending on the model.
Continued on the
following page
Crown
Minute hand
Date
Button A
Button B
Hour hand
Indicator hand
Second hand
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ASTRON 8X22 GPS SOLAR          
BEFORE USE
3
Check the charging status. P. 13
How to charge the watch P. 14
Hand
position
full middle low
Display
Hand
position
(OFF) DST (ON)
Display
Hand
position
In-flight mode
( ) status
Display
In-flight mode ( ) P. 21
Display of charging status
Display of DST
(Daylight Saving Time)
Display of receiving process
Display of in-flight mode ( )
Receiving
process
1 (time
adjustment)
4+ (time zone
adjustment)
Receiving leap
second data
Display
Y ... Reception successful
(8-second position)
N ... Reception failed
(22-second position)
[Checking the reception
result] P. 28
Display of
reception result
Indicator hand display and reception result display
Position of each display may differ depending
on the model (design).
Check DST (Daylight Saving Time) P. 20
Set DST (Daylight Saving Time) P. 19
Check the reception result P. 28
Manual time adjustment P. 23
Time zone adjustment P. 17
Automatic time adjustment P. 25
Receive leap second data P. 27
Continued on the
following page
12
ASTRON 8X22 GPS SOLAR          
BEFORE USE
3
Time zone display and list of time zones around the world
City
code
Display
of time
difference
City name UTC
± hours
BJS 8Beijing +8
Eucla +8.75
TYO 9Tokyo +9
ADL Adelaide +9.5
SYD 10 Sydney +10
Lord Howe Island
+10.5
NOU 11 Nouméa + 11
Norfolk Island +11.5
WLG 12 Wellington +12
Chatham Islands
+12.75
TBU 13 Nuku’alofa +13
CXI 14 Kiritimati +14
–12 Baker Island 12
MDY 11
Midway islands
11
City
code
Display
of time
difference
City name UTC
± hours
LON UTC London 0
PAR 1
Paris/Berlin
+1
CAI 2Cairo +2
JED 3Jeddah +3
Tehran +3.5
DXB 4Dubai +4
Kabul +4.5
KHI 5Karachi +5
DEL Delhi +5.5
Kathmandu +5.75
DAC 6Dhaka +6
Yangon +6.5
BKK 7Bangkok +7
City
code
Display
of time
difference
City name UTC
± hours
HNL 10 Honolulu 10
Marquesas Islands
–9.5
ANC –9 Anchorage –9
LAX –8 Los Angeles –8
DEN –7 Denver –7
CHI –6 Chicago –6
NYC –5 New York –5
Caracas 4.5
SDQ –4
Santo Domingo
–4
St. Johns –3.5
RIO –3
Rio de Janeiro
–3
FEN –2 Fernando de
Noronha 2
PDL –1 Azores –1
The displays of city code and the time difference from UTC are subject to change depending on model.
“·” between figures of the display of time difference shows that there is a time zone in that place.
The following list shows the relationship between displays of the bezel and dial ring and time difference from the UTC.
Please refer to the second hand positions below to set the time zone or to check the time zone setting.
DST (Daylight Saving Time) is used in time zones with a mark.
In the Lord Howe Island time zone in Australia with a mark, the time is advanced by 30 minutes while DST (Daylight
Saving Time) is in effect.
This watch corresponds to DST in the Lord Howe Island time zone.
Display of time zone
Representative city names
28 cities among the total of 40
time zones around the world
Time difference
+14 hours ~ –12 hours
[Check the time zone] P. 20
[Time Zone Adjustment] P. 17
Display of time difference
Each time zone is based on data as of March 2015.
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ASTRON 8X22 GPS SOLAR          
BEFORE USE
3
Indicator display
Charging status
Solution
full
Reception is
allowed.
P. 15
middle
Reception is
allowed, but keep
in mind to charge
the watch.
About charging
P. 15
Indicator display
Movement of second hand
Charging status Solution
1-second
interval
movement
low
The watch is
unable to receive
GPS signals, but
has energy to
operate.
Charge the watch at least until the indicator
hand points to the level position so that the
watch is able to receive GPS signals.
About charging P. 1 4
2-second
interval
movement
The watch is
unable to receive
GPS signals,
and does not
have energy to
operate. (The
energy depletion
forewarning
function is
activated. P. 30)
Continue to charge the watch
at least until the indicator hand
points to the level position so that
the watch is able to continuously
operate and receive GPS signals.
About charging P. 1 4
5-second
interval
movement
The charging status
is not displayed for
in-flight mode ( ).
Change from in-flight to normal
mode.
Return to normal mode ( ) P. 2 1
When the indicator hand points
to “E,” charge the watch following
the above.
About charging P. 1 4
Check the charging status
The indicator hand position shows whether this watch is able or unable to receive GPS signals.
In addition, if the charging status is low, the position of the second hand shows the energy depletion status in further detail.
GPS signal reception requires a lot of energy. Keep in mind to regularly charge the watch by expose to light. About charging P. 14
Reception is
allowed
Reception is
not allowed
14
ASTRON 8X22 GPS SOLAR          
BEFORE USE
3
Illumination
lx (LUX)
Light
source
Condition
(Example)
From the state where the watch is
stopped (not charged)
In the state where
the hand moves
(the watch is
charged)
To fully charged To one-second interval
movement is secured
To move for one day
700
Fluorescent light
General offices 3.5 hours
3,000
Fluorescent light
30W 20cm 420 hours 12 hours 1 hours
10,000
Fluorescent light
Sunlight
Cloudy day
30W 5 cm 115 hours 4 hours 15 minutes
100,000
Sunlight
Sunny day
(Under the direct sunlight
on a summer day)
50 hours 1.5 hours 10 minutes
About charging
How to charge the watch
Expose the dial to light to charge the watch.
Under the following situations, the energy of
the watch is likely to be depleted, resulting in
stoppage of the watch.
The watch is concealed under a sleeve.
The watch is used or stored under conditions
where it cannot be exposed to light for a long
time.
To ensure optimal performance
of the watch, make sure that the
watch is kept sufficiently charged
at all times.
When charging the watch, make sure that the watch is not heated to a high
temperature. (The operational temperature range is between –10 °C and +60 °C
(14 ºF and 140 ºF).)
When first using the watch or starting to use the watch after it has stopped
because of the energy depletion, sufficiently charge the watch referring to the
table on the page at the right.
Standard Charging Time
GPS signal reception consumes a lot of energy. It is necessary to charge
the watch by exposing it to light so that the indicator hand points to the
“middle” or “full” position. (If the charging status is displayed as “low,” the
reception will not start even with manual GPS signal reception.)
Check the charging status. P.13
The required charging time slightly varies depending on the design and the dial color of the
watch.
The figures of “Time required for charging the watch to start moving at one-second
intervals” are estimations of time required to charge the stopped watch by exposing
it to light until it moves at steady one-second intervals. Even if the watch is partially
charged for a shorter period, the watch will resume one-second- interval movement.
However, it may shortly return to two-second-interval movement. Use the charging
time in this column as a rough guide for sufficient charging time.
15
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
• When the
region or time
zone where the
watch is used
is changed
To set only the
time Time zone setting is not
correct
Time zone setting is correct How to manually set the time
P. 41
How to manually set the time
zone P. 22
2. Set the time zone and set the time and date
Basic operation flow
1. Check the place where GPS
signals can be easily received
Place where GPS signals can be easily
received/Place where GPS signals
cannot be received P. 1 6
Receive GPS signals,
set the time zone and
set the time and date
Set DST (Daylight
Saving Time) as
necessary
How to adjust the
time zone P. 18
Set DST (Daylight
Saving Time) P. 19
Set only the time
How to manually
adjust the time
P. 2 4
<
Setting by GPS signal reception
>
<
Manual setting
>
Check the time zone
and DST (Daylight
Saving Time) setting
P. 2 0
Place where GPS signals cannot
be received
Example: Within a subway station
Place where GPS signals can be
easily received
Outdoors under an open sky with
good visibility
16
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
Outdoors under an open sky with good
visibility
The sky cannot be seen or only part of the
sky can be seen.
There is something hindering the reception.
The smaller the sky, the more difficult it is to
receive GPS signals. In addition, it will also
be difficult to receive GPS signals, if there
is something that obstructs the GPS signals
during reception (in particular, during time
zone adjustment).
Easy to receive Cannot receiveDifficult to receive
Place where GPS signals can be easily received/Place where GPS signals cannot be received
There are places where GPS signals can be easily received and places where GPS signals cannot be received.
Examples: • Between tall buildings
• Near wooded area
• Station/Airport
• Indoors with windows
GPS signals cannot be received
depending on window glass type.
Refer to the × Cannot receive.
Examples: • Indoors without windows
• Underground
• During passage of a tunnel
• Through special glass with thermal
emission shield effect, etc.
• Close to equipment generating noise or
performing wireless communications
17
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
The time zone can be adjusted to the local time anywhere in the
world with just one button operation
DST (Daylight Saving Time) can be set manually.
How to adjust the time zone P. 18
Time zone adjustment
When the region or time zone where the watch is used is changed (Time Zone Adjustment)
Continued on the
following page
Precautions on time zone adjustment
If the time zone is adjusted near a time zone boundary, the time
of the adjacent time zone may be displayed.
In some areas the boundaries observed by the watch may not
exactly correlate to the actual time zone markers on the land.
This does not indicate a malfunction.
In this case, set the time zone in the manual time zone setting
mode.
How to manually set the time zone P. 2 2
When the time zone is adjusted while traveling on land, avoid
doing so near time zone boundaries.
In addition, when the watch is used near time zone boundaries,
make sure to check the time zone setting, and manually set the
time zone as necessary.
Failure or success of reception depends on the reception environment.
Place where GPS signals can be easily received/Place where GPS signals
cannot be received P. 16
Even when the reception is successful, DST (Daylight Saving Time) cannot be
automatically set. Set DST (Daylight Saving Time) manually.
Set DST (Daylight Saving Time) P. 19
GPS signal reception consumes a lot of energy.
Keep in mind to regularly charge the watch by expose to light so that the
indicator hand points to the “level position (middle)” or “F (full).
How to charge the watch P. 1 4
If the charging status is displayed as “E (low),” the reception will not start
even with operation of GPS signal reception.
Check the charging status. P. 1 3
18
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
Continue to press Button A (6 seconds),
and then release it when the second hand
moves to the 30-second position.
Go to a place where
GPS signals can be
easily received
1
Move to the outdoors under
an open sky with good
visibility.
Place where GPS signals
can be easily received/Place
where GPS signals cannot
be received P. 16
2 3 When the second hand points to
“Y” or “N, reception is
completed.
Direct the watch face upward and wait 4
How to adjust the time zone
Although the second hand moves to the
0-second position 3 seconds after pressing
Button A, continue to press it.
Check that the reception is successful
after the watch returns to the time
display mode.
Check that the reception was
successful P. 28
Check the time zone setting P. 17
During movement of the date, the buttons
and crown cannot be operated.
Manually set DST (Daylight Saving Time).
Set DST (Daylight Saving Time)
P. 19
The reception result is displayed for 5
seconds.
Then, the hour and minute hands move,
and the time and date are adjusted.
(The time zone is also adjusted to the
local time zone.)
Reception
result
display
Y: Successful
(8-second
position)
N: Failed
(22-second
position)
Display
State Use the
watch as it is.
When the reception
result is displayed as
“N” P. 1 6
When the second hand has reached the
30-second position, reception is started.
The indicator hand points to “4+.
While the indicator hand points to “E” or ,
reception is not started even with operation for
reception.
When the hand points to “E,” charge the watch
by expose to light.
How to charge the watch P. 1 4
Check whether the watch is able/unable to
receive GPS signals
Check the charging status P. 1 3
When the hand points to , deactivate in-flight
mode.
Return to normal mode ( ) P. 2 1
It takes a maximum of
2 minutes to complete
reception.
It depends on the receiving
conditions.
Second
hand
position
25-second
Number of
satellites
5 units
<
Display during reception (= satellites acquisition
status)
>
The second hand indicates ease of receiving
(= number of GPS satellites from which GPS
signals are received).
The larger the
number of acquired
satellites, the easier
it is to receive GPS
signals.
B
P
C
J
J
Y
May
receive
E
a
s
y
t
o
r
e
c
e
i
v
e
C
a
n
n
o
t
r
e
c
e
i
v
e
3 units
4 units
5 units
6 units
2 units
0 units
Please note that it may be difficult to receive GPS
signals while you are in motion.
Even when the hand
points to 4 units or more,
reception may not be
allowed.
To cancel the reception,
press Button B.
Press for
6 seconds
Press
Button B
Continue to press Button A
2
Pull out the crown to the first click Push the crown back in
1 3
19
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
DST (Daylight Saving Time) can be manually set.
Carry out operation of to in the state where DST (Daylight Saving Time) setting is ON.
In operation of , adjust the indicator hand to the OFF” position as shown in the figure at the right.
The hour and minute hands return by one hour.
The second hand returns to the time display
mode.
The indicator hand returns to display the
charging status.
The indicator hand moves to point to “DST (ON),” and the
hour and minute hands advance by one hour.
Turn ON DST (Daylight Saving Time)
Turn OFF DST (Daylight Saving Time)
Set DST (Daylight Saving Time)
The indicator hand moves to indicate the
current DST (Daylight Saving Time) setting.
<
When DST (Daylight Saving Time) setting is OFF
>
In the Lord Howe Island time zone in Australia, the time is advanced by
30 minutes while DST (Daylight Saving Time) is in effect.
This watch corresponds to DST in Lord Howe Island time zone.
DST (Daylight Saving Time) is not automatically changed.
ON/OFF of the DST is not automatically changed over even with operation of time
zone adjustment/manual time zone setting.
When traveling to a region where DST (Daylight Saving Time) is not adopted from
a region where it is adopted, turn off the DST setting.
0 1 2
Pull out
to the first
click
0 1 2
Push
back in
0 1 2
Press for
3 seconds
20
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
Push the crown back inPull out the crown to the first click
1
The indicator hand indicates DST (Daylight Saving Time) setting.
2
Check the time zone and DST (Daylight Saving Time) settings
<
Display of the indicator hand
>
Displays ON/OFF setting of
DST (Daylight Saving Time).
DST
(OFF) DST (ON)
Display
To change the time zone setting
When you are in a place where GPS
signals can be easily received
How to adjust the time zone P.18
When you are in a place where GPS
signals cannot be received
How to manually set the time
zone P. 2 2
For the relationship between the
second hand position and time zone,
refer to the “Time zone display and
list of time zones around the world
P. 1 2 ”.
The second hand returns to the time display
mode.
The indicator hand returns to the display of
charging status.
Also the current time zone of the main-dial and the DST (Daylight Saving Time) can be checked by just pressing and releasing Button B.
0 1 2
Pull out
to the
1st click
0 1 2
Push
back in
Press and hold Button B (3 seconds)
1
21
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
Set to in-flight mode ( ).
Return to normal mode ( ).
Carry out operation .
When the indicator hand points to “the charging status”
as shown in the figure at the right, in-flight mode ( ) can
be deactivated.
When boarding (in-flight mode ( ))
When in-flight mode ( ) is set, the
indicator hand does not indicate the
charging status.
To set the watch to the local time of the
destination in an airplane, etc. (Manual
time zone setting) P. 2 2
The display when the charging status is “full”
The indicator hand indicates
the charging status.
The indicator hand points to .
In-flight mode ( )
Set to in-flight mode ( ) where the
reception may influence operation
of other electronics devices in an
airplane, etc.
In in-flight mode ( ), the GPS signal
reception (time zone adjustment,
manual time adjustment, and
automatic time adjustment) does not
work.
<
In-flight mode ( )
>
The indicator hand points to .
When in-flight mode has been deactivated, the
indicator hand indicates the charging status.
Press for
3 seconds
Pull out the crown to the
first click
1Turn the crown and set the second hand to the time zone of the destination Push the crown back in
2 3
22
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
The second hand returns to the
time display mode.
The indicator hand returns to
display the charging status.
During movement of the date,
the buttons and crown cannot be
operated.
<
Display of the indicator hand
>
Displays ON/OFF setting of DST
(Daylight Saving Time).
If DST (Daylight Saving Time) is not
correct, change over ON/OFF with
reference to “Set DST (Daylight Saving
Time) P. 1 9 ” after operation of .
How to manually set the time zone
The second hand moves
to display the currently set
time zone.
When the crown is turned, the second
hand moves to the next zone.
To set the watch to the local time of the destination in an airplane, etc. (Manual time zone setting)
Manual time zone setting
In places where the time zone cannot be adjusted, the time zone can be set manually.
Place where GPS signals can be easily received/Place where GPS signals cannot be received P. 16
Set the time zone with reference to the “Time zone display and list of time zones around the
world P. 1 2 , to set the watch to the local time and date. Refer to “Set DST (Daylight Saving Time) P. 1 9 ,”
to set DST (Daylight Saving Time).
DST OFF ON
Display
hand
position
DST
Turn the crown clockwise
to advance 1 time zone.
Turn the crown counter
clockwise to set back 1
time zone.
0 1 2
Pull out
to the
1st click
0 1 2
Push
back in
23
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
To set only the time (manual time adjustment)
Continued on the
following page
The watch can be set to the precise current time of the currently set time zone.
(The time zone is not changed.)
How to manually adjust the time P. 2 4
Check the time zone setting P. 2 0
Manual time adjustment
In the manual time adjustment, the precise time of the currently set time zone is displayed.
When the region or time zone where the watch is used is changed, adjust the time zone. How to adjust the time zone P. 1 8
(If the time zone is adjusted, the time zone setting, time and date will be adjusted, so it is not necessary to manually adjust the
time immediately thereafter.)
DST (Daylight Saving Time) is not automatically set. Carry out the setting manually. Set DST (Daylight Saving Time) P. 1 9
Failure or success of reception depends on the reception environment. Place where GPS signals can be easily received/Place
where GPS signals cannot be received P. 1 6
At the time when the reception was successful by manually adjusting the time, automatic time adjustment may be performed. For
details, refer to Automatic time adjustment P. 2 5 .”
GPS signal reception consumes a lot of energy.
Keep in mind to charge the watch regularly by expose to light so that the indicator hand points to the “level position (middle)” or
“F (full). How to charge the watch P. 1 4
(When the charging status becomes “E (low),” the reception will not start even with operation of GPS signal reception.)
Check the charging status. P. 1 3
24
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
How to manually adjust the time
Continue to press Button A (3 seconds), and
then release it when the second hand
moves to the 0-second position.
Go to a place where
GPS signals can be
easily received
1 2 3 When the second hand points
to “Y” or “N, reception is
completed.
Direct the watch face upward and wait 4
While the indicator hand points to “E” or ,
reception is not started even with operation for
reception.
When the hand points to “E,” charge the watch
by exposing it to light.
How to charge the watch P. 1 4
Check the charging status. P. 1 3
When the hand points to , deactivate in-flight
mode ( ).
Return to normal mode ( ) P. 2 1
It takes up to one
minute to complete
reception.
The reception time
depends on the
reception conditions.
Move to the outdoors
under an open sky with
good visibility.
When the second hand has reached the
0-second position, reception is started.
The indicator hand points to “1.
Place where GPS signals
can be easily received/
Place where GPS signals
cannot be received P. 16
<
Display during reception (= satellites
acquisition status)
>
The second hand indicates ease of receiving
(= number of GPS satellites from which GPS
signals are received).
To acquire only time information, the number
of satellites necessary for reception is one.
Number of
acquired
satellites
1 0
Display
State Easy to
receive
Cannot
receive
Reception
result
display
Y: Successful
(8-second
position)
N: Failed
(22-second
position)
Display
State Use the
watch as it is.
When the
reception result
is displayed as
“N” P. 16
To cancel the
reception, press
Button B.
The reception result is displayed for
5 seconds.
Then, the hour and minute hands move,
and the time and date are adjusted.
Check that the reception is successful after
the watch returns to the time display mode.
Check that the reception was successful P. 28
When the time is not correct even if
“Y” is displayed, the time zone may not
correspond to the region where you are.
Check the time zone setting.
Check the time zone and DST (Daylight
Saving Time) settings P. 20
During movement of the date, the buttons
and crown cannot be operated.
Manually set DST (Daylight Saving Time).
Set DST (Daylight Saving Time) P. 19
Press for
3 seconds
Press
Button B
25
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
Automatic time adjustment
This watch can be set to the precise current time by automatically receiving GPS signals by exposure to bright light
outdoors under an open sky to adjust the time.
In addition, when the watch is concealed under a sleeve and the dial is not exposed to sufficient light even if outdoors
under an open sky, the watch stores the time of the previous successful manual time adjustment (or time zone
adjustment), and automatically starts time adjustment at the same time.
In a place without good visibility, GPS signals cannot be received. Place where GPS signals can be easily received/Place where GPS signals cannot be
received P. 1 6
If the energy is sufficiently charged, automatic reception will be performed every day.
The automatic time adjustment is performed at most once per day. Therefore, even if automatic time adjustment has failed, the next automatic time
adjustment will be performed the next day or thereafter.
The time zone is not adjusted in the automatic time adjustment.
When the region where the watch is used is changed, please carry out time zone adjustment. How to adjust the time zone P. 1 8
<
When it is difficult to expose to light sufficiently
>
Even if outdoors under an open sky, when the watch is concealed under a sleeve in winter time, etc., in an area where the
daylight hours are short, or when the watch is not likely to be exposed to sufficient light for a long time due to bad weather, the
watch is designed to allow for automatic time reception at the time when the manual time adjustment was successful the last
time.
When the watch is exposed to the operating environment above, automatic time adjustment is likely to be successful by
making manual time adjustment successful in time periods where the watch is frequently used in a place where GPS signals
can be easily received under an open sky.
How to manually adjust the time P. 2 4
However, as the watch judges to start automatic time adjustment taking into consideration the following conditions,
the watch does not necessarily start automatic time adjustment by exposure to bright light.
• Charging status
Past reception status
When the indicator hand points to “E (low),” or in in-flight mode ( ), automatic time adjustment does not work.
When the indicator hand points to “E,” charge the watch by expose to light. How to charge the watch P. 1 4
 Check the charging status P. 1 3
When the energy is reduced, the period for which automatic time adjustment is not performed becomes longer. Keep in mind to charge the watch regularly.
If the time zone adjustment or manual time adjustment is performed before the automatic time adjustment is started, the automatic time adjustment is not
performed on that day.
Reception
method Time adjustment Time zone adjustment Leap second data
reception
Display
How to manually
adjust the time
P. 23
Automatic time
adjustment P. 25
How to adjust
the time zone
P. 1 7
Features
Time adjustment
Precise current time of the set
time zone is displayed
Time zone identification
and time adjustment
Time zone where you are is
identified, and the precise current
time is displayed
Leap second reception
Ready for leap second data
reception and receiving
Leap second data
P. 2 7
Number of
acquired
satellites
necessary for
reception
One unit (to obtain only time
information)
Basically more than 4 units (to
obtain time information and time
zone information)
Time taken for
reception 6 seconds to 1 minute 30 seconds to 2 minutes 30 seconds to 18 minutes
What kind of
situation
To set the watch to the precise
time while it is used in the same
time zone
When the watch is used in a
different time zone
This is automatically
displayed after automatic
time adjustment or
manual time adjustment is
performed on or after June
1st and December 1st.
26
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
GPS signal reception includes three types. Features for each type are as follows. GPS signal reception Q & A
GPS signal reception
Q: When the watch is moved to a different time zone, does the
watch automatically display the local time?
A: The watch does not automatically display the local time just by
being moved. If you are in a place where GPS signals can be
easily received, adjust the time zone. The watch automatically
displays the local time.
When you are in a place where GPS signals cannot be received,
manually set the time zone.
Manual time zone setting P. 2 2
The watch can be set to all time zones around the world.
Q: Is DST (Daylight Saving Time) automatically changed by
receiving GPS signals?
A: Manually set DST (Daylight Saving Time).
Set DST (Daylight Saving Time) P. 1 9
(GPS signals from GPS satellites do not include information
about DST (Daylight Saving Time).)
Even in the same time zone, some countries and regions do not
adopt DST (Daylight Saving Time).
DST (Daylight Saving Time) P. 1 2
Q: Is it necessary to carry out special operation for years in which a
leap second is added?
A: No special operation is necessary.
Since the watch receives leap second data at the same time of
receiving GPS signals on or after June 1st and December 1st,
a leap second is automatically added by periodically receiving
GPS signals. For details, refer to “Leap second (automatic leap
second reception function) P. 2 7.
27
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
Leap second (Automatic leap second reception function)
Receiving Leap Second Data
When the GPS signal reception is performed on
or after December 1st and June 1st, the indicator
hand displays as shown at the right.
When the leap second data reception is
completed, the indicator hand returns to display
the charging status. Use the watch as it is.
The leap second data reception is performed every half a year regardless of leap second addition.
It takes up to 18 minutes to receive the leap second data.
Leap second
The leap second is to compensate for deviations from the universal
time (UT) which is astronomically determined and the “International
Atomic Time (TAI).
“1 second” may be added (deleted) once a year or every few years.
Automatic leap second reception function
A leap second is automatically added by receiving “leap second
data” from GPS signals at the time of leap second addition (delete).
“Leap second data” includes information about future leap second addition and current
leap second data.
When GPS signals are received under the following conditions, the leap second
data reception is also started.
• GPS signals are received after the system reset
• GPS signals have not been received for a long time
• Leap second data reception has failed
(Leap second data reception is performed again during the next GPS signal reception. It is repeated
until the leap second data reception is successful.)
Receiving the leap second data
28
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
2
Press Button A once and
then release it
1
Result Successful Failed
Display
Position Y 8-second
position
N 22-second
position
Type 1 (Time
adjustment)
4+ (Time zone
adjustment)
Display
Check that reception was successful (reception result display)
The type of reception and reception result (success or failure) of the last GPS signal reception is displayed for 5 seconds.
The second hand and indicator hand
display the reception result.
The second hand displays the reception
result (success/failure).
The indicator hand displays which of the
last GPS signal reception was performed for
time adjustment or time zone adjustment.
Second hand: Reception result
(success/failure)
Indicator hand: Reception method (time
adjustment or time zone adjustment)
When Button A is kept pressed, the watch
enters the Manual time adjustment
operation.
After 5 seconds have elapsed or
when Button B is pressed, the watch
returns to the time display mode.
When the reception result
is Y
The reception was successful.
Use the watch as it is.
When the reception result
is N
Move to the outdoors where
GPS signals can be easily
received as necessary to
receive GPS signals.
Place where GPS signals can be easily
received/Place where GPS signals
cannot be received P. 16
When approximately five days have
elapsed after successful reception, the
reception result display becomes “N.”
Even under a state where GPS signal
cannot be received, the watch operates
with quartz accuracy (at loss/gain ±15
seconds per month).
When the reception has failed in
any way, manually set the time
and date.
How to manually set the time P. 41
Check that reception was successful (within 5 seconds)
Press and
then
release
29
ASTRON 8X22 GPS SOLAR          
BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
4
Press Button A and then release it while the result of the
reception is displayed (for 5 seconds) in step 2
3
Second hand: Reception result
(successful / failed)
The second hand and indicator
hand display the reception result.
The second hand displays the result of the GPS signal
reception (time adjustment or time zone adjustment).
The indicator hand points to “1” or “4+” which shows
“time adjustment” or “time zone adjustment”.
The second hand displays the
result of the leap second data
reception (successful / failed).
The indicator hand points to “0”
when leap second data reception is
occurring.
Press Button A and then
release it The result of the reception is displayed
1 2
Check the leap second data reception was successful
The reception result (success or failure) of the regular leap second data reception is displayed for 5 seconds.
Result Successful Failed
Display
Position
Y 8-second
position
N 22-second
position
When the leap second data reception
result is Y (successful)
•The leap second data reception was
successful.
Use the watch as it is.
When the leap second data reception
result is N (failed)
•The leap second data reception,
periodically performed, has not been
successful.
It will be performed automatically
with the next GPS signal reception
(automatic time adjustment/manual
time adjustment).
Use the watch as it is.
The leap second data is received on or after
December 1st and June 1st.
Even when the leap second data reception has
not been successful, the time is correct until
the leap second data is added (deleted).
The indicator hand points to “4+” as a result of time zone adjustment.
Second hand: Reception result (successful / failed)
Result Successful Failed
Display
Position Y 8-second
position
N 22-second
position
After 5 seconds have elapsed or when Button B is
pressed, the watch returns to the time display mode.
When Button A is kept pressed,
the watch enters the Manual time
adjustment operation.
After 5 seconds have elapsed, or when
Button B is pressed, the watch returns
to the time display mode.
When Button A is kept pressed,
the watch enters the Manual time
adjustment operation.
Press and
then
release
Press and
then
release
30
ASTRON 8X22 GPS SOLAR          
IN CASE OF AN UNUSUAL MOVEMENT OF THE SECOND HAND
5
Second hand movement and watch state (energy depletion forewarning function)
Continued on the
following page
2-second interval movement 5-second interval movement
State
The second hand moves at 2-second intervals. The second hand moves at 5-second intervals.
Restriction on function/
display
Reception is not started even with operation of GPS signal
reception.
Automatic time adjustment does not work.
The hour hand, minute hand, and date stop.
Reception is not started even with operation of GPS signal
reception.
Automatic time adjustment does not work.
Solution
(1) First, charge the watch by expose to light until the second hand
moves at 1-second intervals.

How to charge the watch P. 1 4
(2) Keep in mind to charge the watch until the indicator hand points
to the middle position or full position. (If the indicator hand
points to low position, GPS signals cannot be received.)

Check the charging status P. 1 3
(1) Charge the watch until the indicator hand points to the middle
position or full position.

Check the charging status P. 1 3
(2) Carry out time zone adjustment to set the time.

How to adjust the time zone P. 1 8
Movement of the second hand shows the state of the watch (working functions).
2-second interval movement/5-second interval movement are brought about
When the energy stored in the watch runs low, the energy depletion forewarning function will work.
When the energy stored in the watch runs low, charge the watch by expose to light. How to charge the watch P. 1 4
When the energy depletion forewarning function works, the watch does not operate even with operation of the buttons and crown.
(Be assured that it does not mean a failure)
31
ASTRON 8X22 GPS SOLAR          
IN CASE OF AN UNUSUAL MOVEMENT OF THE SECOND HAND
5
Power Save 1 Power Save 2
State
The second hand stops pointing at the
15-second position.
The second hand stops pointing at the
45-second position.
Restriction
on function/
display
The hour hand, minute hand and date stop.
Automatic time adjustment is not performed.
The hour hand, minute hand and date stop.
(Date displays “1”.)
Reception is not started even with operation
of GPS signal reception.
Automatic time adjustment is not performed.
The indicator hand points to low position.
Cause
When the watch is exposed to a state without
receiving an adequate light source for 72
hours or longer.
When the watch is in an insufficient charging
state for a long time.
Solution
When the watch is exposed to an adequate
light source for more than 5 seconds, or when
any button is pressed, it displays the current
time again after the second hand is rapidly
advanced.
(1) Charge the watch sufficiently until the
charging status is displayed as the middle
position or full position. P. 13 ~ 14
(2) Carry out time zone adjustment to set the
time. P. 17 ~ 18
Power Save 2
While the watch is being charged, the second hand moves at “5-second intervals”. During the “5-second Interval Movement,” the buttons cannot be operated.
If the “ Power Save 2” mode is prolonged, the stored power amount drops and the internal current time information stored will be lost.
The second hand stops at the 15-second position/
45-second position (Power save function)
When the watch is not exposed to light for a long time, the power save function will work.
32
ASTRON 8X22 GPS SOLAR          
TO PRESERVE THE QUALITY OF YOUR WATCH
6
The above figures are examples. Both of them may be
different from the figure on the case back of your watch.
The case back shows the performance and caliber /
case number of your watch
Daily care Performance and caliber / case number
The watch requires good daily care
• Do not wash the watch when its crown is at the extended position.
Wipe away moisture, sweat or dirt with a soft cloth
After soaking the watch in seawater, be sure to wash the watch in clean
pure water and wipe it dry carefully.
If your watch is rated as “non-water resistant” or “water resistant for daily use,” do not
wash the watch.
Performance and caliber / case number P. 3 2
Water resistance P. 3 3
Turn the crown from time to time
• In order to prevent corrosion of the crown, turn the crown from time to
time.
Press the buttons once in a while.
• Press the buttons once in a while to prevent corrosion of the buttons.
Caliber/case number
The number to identify
the type of your watch
Water resistance
Refer to P. 3 3
Magnetic resistance
Refer to page P. 3 4
8
X
2
2
-
0
A
A
0
-
2
8
X
2
2
-
0
A
A
0
-
2
33
ASTRON 8X22 GPS SOLAR          
TO PRESERVE THE QUALITY OF YOUR WATCH
6
Indication on the case back Water resistant performance Conditions of Use
Water Resistant 10 (20) Bar Water resistance for everyday life at 10 (20) barometric pressures The watch is suitable for diving without an air cylinder.
Water resistance
Refer to the table below for the description of each degree of water resistant performance of your watch before using.
34
ASTRON 8X22 GPS SOLAR          
TO PRESERVE THE QUALITY OF YOUR WATCH
6
Examples of common magnetic products that may affect watches
Magnetic resistance (Magnetic influence)
Keep the watch more than 5cm away from magnetic products.
If the watch becomes magnetized and its accuracy deteriorates to an
extent exceeding the specified rate under normal use, there will be
a charge for demagnetization and accuracy readjustment even if it
occurs within the guarantee period.
The reason why this watch is affected by magnetism
The built-in motor is provided with a magnet, which may be
influenced by a strong external magnetic field.
This watch may be affected by nearby magnetism and temporarily
gain or lose time or stop operating.
Even when the watch gains or loses time due to magnetic influence, the hand positions
are automatically adjusted by the “automatic hand position adjustment function.” (P. 42)
This watch has magnetic resistance which complies with ISO
“Magnetic resistant watches”.
Caution
Smartphone, cellular phone,
tablet terminal (speaker)
AC adapter Bag
(with magnet
buckle)
AC-powered
shaver
Magnetic
cooking device
Portable radio
(speaker)
Magnetic
necklace
Magnetic
healt pillow
35
ASTRON 8X22 GPS SOLAR          
TO PRESERVE THE QUALITY OF YOUR WATCH
6
Band
Notes on the
length of the
band
Notes on skin
irritation and
allergy
Skin irritation caused by a band has various reasons such
as allergy to metals or leathers, or skin reactions against
friction on dust or the band itself.
Adjust the band to allow a little clearance with
your wrist to ensure proper airflow. When
wearing the watch, leave enough room to insert a
finger between the band and your wrist.
Metallic band
Moisture, sweat or soil will cause rust even on a stainless steel band if they
are left for a long time.
Lack of care may cause a yellowish or gold stain on the lower sleeve edge of
shirts.
Wipe off moisture, sweat or soil with a soft cloth as soon as possible.
To clean the soil around the joint gaps of the band, wipe it out in water and
then brush it off with a soft toothbrush (Protect the watch body from water
splashes by wrapping it up in plastic wrap etc.)
Because some titanium bracelets use pins made of stainless steel, which has
outstanding strength, rust may form in the stainless steel parts.
If rust advances, pins may poke out or drop out, and the watch case may fall
off the bracelet, or the clasp may not open.
If a pin is poking out, personal injury may result. In such a case, refrain from
using the watch and request repair.
Leather band
A leather band is susceptible to discoloration and deterioration from
moisture, sweat and direct sunlight.
Wipe off moisture and sweat as soon as possible by gently blotting them up
with a dry cloth.
Do not expose the watch to direct sunlight for a long time.
Please take care when wearing a watch with light-colored band, as dirt is
likely to show up.
Refrain from wearing a leather band watch other than Aqua Free bands while
bathing, swimming, and when working with water even if the watch itself is
water-resistant enforced for daily use (10-BAR/20-BAR water resistant).
Polyurethane band
A polyurethane band is susceptible to discoloration from light, and may be
deteriorated by solvent or atmospheric humidity.
A translucent, white, or pale colored band easily adsorbs other colors,
resulting in color smears or discoloration.
Wash out dirt in water and clean it off with a dry cloth. (Protect the watch
body from water splashes by wrapping it up in plastic wrap etc.)
When the band becomes less flexible, have the band replaced with a new
one. If you continue to use the band as it is, the band may develop cracks or
become brittle over time.
Silicone band
As for material characteristics, the band is easily dirtied, and may be stained
and discolored. Wipe off dirt with a wet cloth or cleaning tissue.
Unlike bands of other materials, cracks may result in the band being cut.
Take care not to damage the band with an edged tool.
The band touches the skin directly and becomes dirty with sweat or dust.
Therefore, lack of care may accelerate deterioration of the band or cause skin
irritation or stain on the sleeve edge. The watch requires a lot of attention for
long usage.
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6
1 2
How to use an adjustable three-fold clasp
1
3
2
4
Press the button on both sides of
the flap ; pull the buckle up.
The band will automatically come
out of the loop.
With pressing buttons on both sides
of the flap, pull the leather band
out of the moveable loop and fixed
loop. Then open the clasp.
Pull the pin out of a adjustment hole
of the band.
Slide the band to adjust its length
and find an appropriate hole. Place
the pin into the hole.
Place the tip of the band into the
moveable loop and fixed loop, and
fasten the clasp by pressing the
frame of the buckle.
Press the push buttons again to
unfasten the flap.
Fasten the flap.
Some bands are provided with an
adjustable three-fold clasp.
If the clasp of the watch you purchased is
as follows, please refer to the following
instructions.
How to wear or take off the watch
How to adjust the length of the leather band
The above illustrations are provided as examples.
Some details may differ depending on the model.
Push button
Flap
Buckle
Moveable loop
Fixed loop
Push button
Flap
Buckle
Moveable loop
Fixed loop
Pin Adjustment hole
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Lumibrite
Condition Illumination
Sunlight
Fine weather 100,000 lux
Cloudy weather 10,000 lux
Indoor (Window-side
during daytime)
Fine weather more than 3,000 lux
Cloudy weather 1,000 to 3,000 lux
Rainy weather less than 1,000 lux
Lighting apparatus
(Distance from 40-watt
daylight fluorescent
light)
1 m 1,000 lux
3 m 500 lux (average room luminance)
4 m 250 lux
If your watch has Lumibrite
Lumibrite is a luminous paint that is completely harmless to human beings and natural environment, containing no
noxious materials such as radioactive substance. Lumibrite is a newly-developed luminous paint that absorbs the light
energy of the sunlight and lighting apparatus in a short time and stores it to emit light in the dark. For example, if
exposed to a light of more than 500 lux for approximately 10 minutes, Lumibrite can emit light for 3 to 5 hours.
Please note, however, that, as Lumibrite emits the light it stores, the luminance level of the light decreases gradually
over time. The duration of the emitted light may also differ slightly depending on such factors as the brightness of the
place where the watch is exposed to light and the distance from the light source to the watch.
In general, when you enter a dark place from a bright environment, your eye cannot adapt to the change in light levels quickly. At first, you can hardly see anything,
but as time passes, your vision gradually improves. (Dark adaptation of the human eye)
<
Reference data on the luminance
>
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Power Source
The battery used in this watch is a special secondary battery,
which is different from ordinary batteries. Unlike an ordinary silver
oxide battery, the secondary battery does not require periodic
replacement.
The capacity or charging efficiency may gradually lower due to
long-term use or operating environment. In addition, long-term
use may shorten the charge duration due to wear, contamination,
lubricant deterioration of mechanical parts, etc. Request repair
when the performance lowers.
Overcharge prevention function
When the secondary battery is fully charged, the overcharge
prevention function is automatically activated to avoid further
charging. There is no need to worry about damage caused by
overcharging no matter how much the secondary battery is charged
in excess of the "time required for fully charging the watch".
Refer to "Standard charging time" on page 14 to check the time required for fully
charging the watch.
When the watch has not been charged for a long time
If the watch has not been charged for a long time, the watch will be
completely discharged and no longer able to be charged.
In this case, consult the retailer from whom the watch was
purchased.
WARNING
Notes on replacing the secondary battery
Do not remove the secondary battery from the watch.
Replacement of the secondary battery requires professional
knowledge and skill. Please ask the retailer from whom the
watch was purchased for replacement of the secondary battery.
Installation of an ordinary silver oxide battery can generate
heat that can cause bursting and ignition.
Notes on charging the watch
When charging the watch, do not place the watch in close
proximity to an intense light source such as lighting
equipment for photography, spotlights or incandescent lights,
as the watch may be excessively heated resulting in damage to
its internal parts.
When charging the watch by exposure to direct sunlight,
avoid places that easily reach high temperatures, such as a car
dashboard.
Always keep the watch temperature under 60°C (140 ºF).
WARNING
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After-sale service
Notes on guarantee and repair
Contact the retailer from whom the watch was purchased or SEIKO
WORLWIDE SERVICE NETWORK for repair or overhaul.
Within the guarantee period, present the certificate of guarantee to
receive repair services.
Guarantee coverage is provided in the certificate of guarantee. Read
carefully and retain it.
For repair services after the guarantee period has expired, if the
functions of the watch can be restored by repair work, we will
undertake repair services upon request and payment.
Replacement parts
Please keep in mind that if original parts are not available, they may
be replaced with substitutes whose outward appearance may differ
from the originals.
Inspection and adjustment by disassembly and
cleaning (overhaul)
Periodic inspection and adjustment by disassembly and cleaning
(overhaul) is recommended approximately once every 3 to 4 years
in order to maintain optimal performance of the watch for a long
time. According to use conditions, the oil retaining condition of your
watch mechanical parts may deteriorate, abrasion of the parts may
occur due to contamination of oil, which may ultimately lead the
watch itself to stop. As the parts such as gasket may deteriorate,
water-resistant performance may be impaired due to intrusion
of perspiration and moisture. Please contact the retailer from
whom the watch was purchased for inspection and adjustment by
disassembly and cleaning (overhaul). For replacement of parts,
please specify “SEIKO GENUINE PARTS.When asking for inspection
and adjustment by disassembly and cleaning (overhaul), make sure
that the gasket and push pin are also replaced with new ones.
When your watch is inspected and adjusted by disassembly and
cleaning (overhauled), the movement of your watch may be
replaced.
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When the watch is unable to receive GPS signals
Continued on the
following page
Adjust the time under a condition in which the watch
is unable to receive GPS signals (Manual time setting)
The second hand stops at the 45-second position before the reception is
completed (The watch enters the power save 2 state)
If GPS signal reception is performed under low temperatures (0°C or less) in a
state where the charging capacity and/or charging efficiency are lowered, the
reception will be stopped, and the watch may enter the power save 2 state.
GPS signal reception consumes a significant amount of energy. Keep in mind to
charge the watch regularly by exposure to light.
How to charge the watch P. 1 4
If this occurs frequently, consult the retailer from whom the watch was
purchased.
Manual time setting
When a problem cannot be solved even by carrying out the Points
to be checked, or time is gained or lost under a condition in which
the watch is unable to receive GPS signals and the watch is unable to
receive GPS signals continuously, set the time manually.
Points to be checked
When the watch does not start receiving or is unable to receive GPS
signals even with operation of GPS signal reception, the following can
be considered.
Reception is not started even with operation of GPS signal
reception (time zone adjustment/manual time adjustment).
Check the indicator hand position.
Reception is not possible even with operation of GPS signal
reception (time zone adjustment/manual time adjustment) (The
reception result is displayed as “N.”)
Move to a place where GPS signals can be easily received.
Place where GPS signals can be easily received/Place where
GPS signals cannot be received P. 1 6
Indicator
display
Charging status
In-flight mode ( )
low
Display
Solution
Charge the watch by
exposure to light until the
indicator hand points to
the middle position or full
position. (P. 1 4 )
Deactivate in-flight
mode ( ). P. 21
Reception is
not allowed
Pull out the crown to the
second click
Press Button B and then release it
Push the crown back in
(simultaneously with a time
signal)
12 3 4
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Operation has been completed.
The watch resumes its normal
movement.
The second hand stops at that
place.
The second hand moves to stop at
the 0-second position.
The watch enters the manual time
setting mode.
Turn the crown to set the time
Turn the crown clockwise to
advance the time.
Turn the crown counter
clockwise to set back the
time.
Turn quickly to
move continuously.
Turn again to stop
moving.
When it has moved continuously for 12
hours, it will stop.
Turn the crown to continue setting.
The point in which the date changes is at
0:00 AM (12:00 PM). Set the time taking
into consideration AM or PM.
Even if GPS signals cannot be received, the watch can be used with the same accuracy as a
normal quartz watch. (at loss/gain ±15 seconds per month on average)
If the watch receives GPS signals after manual time setting, it displays the received time.
How to manually set the time
When using the watch again under a condition in which the watch is able to receive GPS signals, receive GPS signals to set the time.
When adjusting the time, the date will also be adjusted.
When the watch enters the manual time
setting mode, the reception result will
be displayed as “N,” since the reception
results data will be lost.
0 1 2
Pull the
crown to
the second
click
Press and
then
release
0 1 2 Push
back in
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When the date, indicator hand or hour/minute/second hand position is misaligned
Points to be checked
Reception was successful (the reception result is displayed as “Y”),
but time has gained or lost.
Check the time zone setting.
Check the time zone setting and DST (Daylight Saving Time)
setting. P. 2 0
If the currently set time zone does not correspond to the region where you are, set the time
zone by either of the following operations.
Place where GPS signals can be easily received How to adjust the time zone P. 1 8
Place where GPS signals cannot be received How to manually set the time zone P. 2 2
Check DST (Daylight Saving Time) setting.
Check the time zone setting and DST (Daylight Saving Time)
setting P. 2 0
If DST (Daylight Saving Time) setting does not correspond to the addition conditions of
DST (Daylight Saving Time) of the region where you are, set DST (Daylight Saving Time)
with reference to “Set DST (Daylight Saving Time) P. 1 9 .”
Automatic time adjustment function may not have been activated
for a few days.
Automatic time adjustment P. 25
The automatic time adjustment function is unlikely to be activated due to low energy
stored in the watch or depending on the environment.
To immediately adjust the time, refer to “How to adjust the time zone P. 1 8 . ”
Preliminary position
When the watch is unable to display the precise time or date, or the
indicator hand does not point to the correct position even when it has
successfully received GPS signals, the preliminary position may be
misaligned.
The preliminary position is misaligned due to the following reasons.
Strong impact such as dropping
or hitting
When comparing the state of “Misaligned Preliminary Hand Position” to that of a weight scale, it is
like “a scale which is unable to display the correct weight because its needle is not set to the zero
position before weighing.
Adjusting the preliminary position of the hour, minute
and second hands (Automatic hand position adjustment
function)
The hour, minute and second hands have an “automatic hand position adjustment function,
which automatically corrects an incorrect preliminary position.
The automatic hand position adjustment function is activated once a minute for the second hand
and at 12:00 both for the AM and PM for the hour and minute hands.
This function works when the preliminary hand position is misaligned due to external factors
such as strong impact or magnetic influence. It does not work to adjust accuracy of the watch or
slight misalignment which may occur during the manufacturing process.
The preliminary position of the hour and minute hands can be manually adjusted.
Adjust the preliminary position of the date, indicator hand, and hour/minute hands P. 4 3
Adjusting the preliminary position of the date, and
indicator hand
Since the preliminary position of the date, and indicator hand is not
automatically adjusted, it must be adjusted manually.
Adjust the preliminary position of the date, indicator hand, and hour/minute hands P. 4 3
Things around you which generate magnetism
Examples of common magnetic products that may
affect watches P. 34
Pull out the crown to the second
click.
Continue to press Button A (three
seconds).
1 2
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Adjust the preliminary position of the date, indicator hand, and hour/minute hands
The second hand stops. The watch enters the mode to adjust
the preliminary position of the date.
Preliminary position of
this watch
The preliminary position of the date is
“1” (1st).
The preliminary position of the
indicator hand is “low”.
The preliminary position of the hour/
minute hands is “12:00 am.”s
During movement of the date, the buttons
cannot be operated.
The second hand stops at the 13-second
position. The date turns and stops to indicate
the preliminary position.
Continued on the
following page
Rotate the crown to set the date to
1.”
3
Adjust the date so that the position of “1”
will locate at the center of the window.
If “1” is displayed, go to operation of .
Turn the crown
quickly to move it
continuously. Turn
the crown again to
stop.
Turn the crown
clockwise to advance
1 step.
Turn the crown
counterclockwise to set
back 1 step.
0 1 2
Pull out
the crown to
the second
click
Press for
three
seconds
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Press Button A and then release it.
4
The watch enters the mode to adjust
the preliminary position of the
indicator hand.
The second hand stops at the
44-second position.
Continued on the
following page
Rotate the crown to adjust the indicator
hand as shown in the figure.
5
Adjust the indicator hand to the position as
shown in the figure.
If the indicator hand points as shown in the figure,
go to operation of .
The indicator hand makes one complete turn, but
this does not mean a failure.
Turn the crown
quickly to move
it continuously.
Turn the crown
again to stop.
Turn the crown
clockwise to
advance 1 step.
Turn the crown
counterclockwise
to set back 1 step.
Press and
then
release
Set the time by
receiving GPS signals.
Press Button A and then
release it.
6 9
45
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Continue to press Button
B (three seconds).
7
The hour/minute hands
move, and stop at “12:00
am.
The second hand
stops at the 0-second
position.
After operation of to
is completed, make
sure to set the time.
When you are in a place
where GPS signals cannot
be received
Carry out manual time zone
setting
How to manually set the time
zone P. 22
Manually set the time
How to manually set the time
P.41
When the time is set,
operation is completed.
When you are in a place where
GPS signals can be easily
received, adjust the time zone.
How to adjust the time zone P. 18
Push the crown back
in.
8
The watch exits the mode
to adjust the preliminary
position, and the second
hand and the hour/minute
hands start moving.
The watch goes into the
preliminary position setting
mode of the hour and
minute hands.
Press and
then
release
Press
Button B
for three
seconds
0 1 2
Push the
crown
back in
Continue to press Button A and
Button B simultaneously (three
seconds).
1Continue to press Button A (three seconds). Press Button B
2 3
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ON” or OFF” of light detection can be selected.
The second hand that has pointed to Y (8-second position: ON)
turns to point to N (22-second position: OFF).
The watch returns to the time display
mode.
Cancel the light detection
Cancel the setting of light detection
How to turn the light detection on
Perform the operations to to turn the light detection on.
Adjust the second hand to point to Y (8-second position: ON) in the operation .
The light detection can be cancelled.
While the light detection is disabled, the automatic time adjustment setting is altered to the fixed time reception setting. In such a case, the watch stores
the time of the previously successful manual time adjustment, and automatically starts time adjustment at the same time.
The light detection is turned on by default.
The second hand stops at the 8-second
position.
Press Button
A and Button B
simultaneously
for three
seconds
Press
Button A
for three
seconds
Press
Button B
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At trouble Possible causes Solutions Reference
pages
Hand
Movement
The second hand moves at
2-second intervals.
The energy depletion forewarning function is activated.
(P. 30)
If the second hand moves at 2 or 5-second intervals
while you wear the watch everyday, the watch is in a
condition where it cannot acquire sufficient light, for
instance, the watch is concealed under a long sleeve
shirt.
Charge the watch sufficiently until the second hand moves
at 1-second intervals and the indicator hand points to the
middle position or full position.
Be careful not to conceal the watch under a sleeve, etc., while wearing it.
When taking off the watch, place it in as bright a location as possible.
P. 1 3
P. 1 4
The second hand moves at
5-second intervals.
The stopped second hand
pointing to the 15-second
position started operating.
The power save function 1 has been activated (P. 31)
When the watch has not been exposed to sufficient
light continuously, the power save function 1 to limit
energy consumption is automatically activated.
When the watch is exposed to light, the hand will rapidly advance and return to
the current time.
When the watch returns to the current time, use it as is. (This is not an
abnormal movement.)
The stopped second hand
pointing to the 45-second
position started operating.
The power save function 2 has been activated (P. 31)
When the watch is not sufficiently charged for a
certain period of time, the power save function 2 is
automatically activated.
Charge the watch until the indicator hand points to the middle position or full
position.
After that, when the time is incorrect, adjust the time zone as necessary.
P. 1 3
P. 1 4
P. 17 ~ 18
The watch hands advance
rapidly unless a button
is pressed. After the
rapid advancement is
completed, the watch
resumes its normal
1-second interval
movement.
The power save function has been activated. (P. 31)
The automatic hand position alignment function was
activated.
When the hand positions deviate to display incorrect
time as a result of external influences, etc., the
watch automatically corrects the hand misalignment by
the automatic hand position alignment function.
No operation is needed (this is not an abnormal movement).
The indicator hand
indicates the position
between “1” and “in-flight
mode.
The automatic leap second reception
function is operating. (P. 27)
It takes up to 18 minutes to receive the leap second data.
Pay attention to the reception place (Place where GPS signals can be easily
received P. 1 6 ).
P. 27
middle
position
Troubleshooting
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At trouble Possible causes Solutions Reference
pages
GPS signal
reception
Reception is not started
even with operation of
time zone adjustment/
manual time adjustment
The charging status has been
displayed as low position. (P. 11 )
Charge the watch sufficiently until the charging status is
displayed as the middle position or full position. P. 1 3
In-flight mode ( ) has been set. (P. 21)After relocation from a place under restriction on use of GPS signals (in an
airplane, etc.), deactivate in-flight mode ( ). P. 21
Reception fails even if GPS
signals are received. (The
reception result is “N.”)
You are in a place where GPS signals cannot be
received (P. 1 6 ). Receive GPS signals in a place where GPS signals can be easily received. P. 1 6
GPS signals cannot be
received even by carrying
out GPS signal reception
(The reception result is
displayed as “N.”)
You are in a place where GPS signals cannot be
received. (P. 1 6 )Receive GPS signals in a place where GPS signals can be easily received. P. 1 6
GPS signals have been
received successfully
(the reception result is
displayed as “Y,”) but the
time and date are gained
or lost (when the reception
result of time adjustment
is displayed)
The time zone that does not correspond to the region
where you are has been set.
Check the time zone setting.
If the time zone does not correspond to the region where you are, adjust the
time zone.
• When you are in a place where GPS signals can be easily received
How to adjust the time zone
• When you are in a place where GPS signals cannot be received
How to manually set the time zone
P. 20
P. 1 8
P. 22
DST (Daylight Saving Time) setting does not correspond
to the addition conditions of DST (Daylight Saving
Time).
Check DST (Daylight Saving Time) setting. P. 20
middle
position
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At trouble Possible causes Solutions Reference
pages
GPS signal
reception
The reception result is
displayed as “Y,” but the
time and date are gained
or lost (when the reception
result of time zone
adjustment is displayed)
DST (Daylight Saving Time) setting does not correspond
to the addition conditions of DST (Daylight Saving
Time).
Check DST (Daylight Saving Time) setting. P. 20
The position of the hands is misaligned due to external
factors.
The preliminary position of the hands is misaligned.
Preliminary position P. 42
<Hour/minute hand misalignment> The automatic hand position adjustment
function is activated to automatically adjust the positions. Please use the
watch as it is. The automatic hand position alignment function is activated
once a minute for the second hand and at 12:00 AM and PM for the hour and
minute hands.
<Date misalignment> Since the preliminary position is not automatically
adjusted, manually adjust the position.
When misalignment of the hand is not adjusted, refer to the Adjust the
preliminary position of the date, indicator hand, and hour/minute hands” to
carry out operation.
When misalignment of the hand is not adjusted even with operation of ,
consult the retailer from whom the watch was purchased.
P. 42
P. 43
The reception result is
displayed as “Y,” but the
time is gained or lost by
one to two seconds.
The automatic time adjustment function has not been
activated for a few days.
If the energy stored in the watch is insufficient, the automatic time adjustment
function may be activated once in 3 days. P. 25
The automatic time
adjustment function is not
activated every day
Conditions to activate the automatic time adjustment
function are not prepared.
Sufficient energy is necessary to activate the automatic time adjustment
function. The time adjustment function is automatically activated by exposure
to bright light.
P. 25
Automatic reception is not
activated.
The watch is not in an environment where GPS signals
can be received at the moment when light is exposed.
Cancel the function that reception is automatically started by light so that the
watch only carries out the fixed time reception. The fixed time in this case
means the last time when manual time adjustment was successful.
<How to turn the automatic light reception function on or off>
1. Continue to press Buttons A and B simultaneously (3 seconds)
The second hand indicates ON or OFF of the function, Y (8-second position:
ON) and N (22-second position: OFF).
2. Continue to press Button A (3 seconds) to turn the function on/off.
P. 46
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At trouble Possible causes Solutions Reference
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Misalignment
of time and
hands
The position of the second
hand showing “reception
result” and “number of
acquired satellites from
which GPS signals are
received” is misaligned.
The preliminary position of the second hand is
misaligned. (This occurs when the position of the
second hand is misaligned due to external factors.)
Preliminary position P. 43
The automatic hand position alignment function is activated to automatically
adjust the position. Please use the watch as it is. The automatic hand
position alignment function is activated once a minute for the second hand.
When misalignment of the hand is not adjusted even with operation of ,
consult the retailer from whom the watch was purchased.
P. 42
The watch temporarily
gains or loses time.
The automatic time adjustment function has not been
activated for a few days.
If the energy stored in the watch is insufficient, the automatic time adjustment
function may be activated once in 3 days.
To adjust the time immediately, carry out “manual time adjustment.
P. 25
P. 24
The watch received an incorrect time due to external
factors (erroneous reception).
Receive GPS signals in a place where GPS signals can be more easily
received.
Adjust the time zone as necessary.
P. 1 6
P. 1 8
The watch is left in an extremely high or low
temperature place for a long time.
If the watch is returned to a normal temperature place, the accuracy will be
recovered.
If the time is incorrect after that, manually adjust the time as necessary.
If the watch is not recovered, consult the retailer from whom the watch was
purchased.
P. 24
The time is gained (lost)
1 hour DST (Daylight Saving Time) is ON (or OFF). Check DST (Daylight Saving Time) setting. P. 20
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At trouble Possible causes Solutions Reference
pages
Charging the
solar battery
The stopped watch was
exposed to an adequate
light for longer than the
time required to fully
charge the watch, however,
it does not resume its
normal 1-second interval
movements.
The amount of exposed light is too weak.
The time for charging the watch is not sufficient.
The time required for charging the watch depends entirely on the amount of
exposed light the watch receives.
Refer to“ Standard charging time” to charge the watch.
P. 1 4
The second hand is
stopped even when the
watch is charged for longer
than the time required to
fully charge the watch
(P. 1 0 ).
The watch was not charged for a long time and has
been discharged completely. Contact the retailer from whom the watch was purchased.
Misalignment
of date
After the reception is
successful, the time is
correct but the date is
incorrect.
The preliminary position of the date is out of alignment.
This problem occurs when the preliminary position of
the date is out of alignment due to external influence
etc.
Adjust the preliminary position of the date to the correct position “1” (the first
day of a month). P. 43 ~ 46
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Indicator hand
misalignment
The position of the hand
showing the reception
way, charging status, in-
flight mode ( ), and DST
is misaligned
The automatic leap second reception
function has been activated.
(The indicator hand displays as shown at
the right.)
It takes up to 18 minutes to complete the leap second reception.
Use the watch with reference to the “Place where GPS signals can be easily
received P. 1 6 .”
P. 27
The preliminary position of the indicator hand is
misaligned.
This occurs when the preliminary position of the
indicator hand is misaligned due to external factors.
Adjust the preliminary position of the indicator hand to the
correct position. P. 43 ~ 45
Operation
The crown or buttons
cannot be operated.
The stored electric power is running short. Sufficiently charge the watch until it starts moving at 1-small second intervals. P. 1 4
Date is moving right after a setting is carried out by the
crown or button operation.
Wait without doing anything.
After the date stops, the crown and buttons can be operated.
You get lost in the middle
of the operation.
———
When the crown is pulled out
Push the crown back in.
The second hand will start to move within 6 minutes.
After that, restart operation.
When the crown is not pulled out
Press Button B.
The second hand will start to move within 2 minutes.
After that, restart operation.
Other
trouble
Blur on the dial glass
persists.
Small amount of water has got inside the watch due to
deterioration of the gasket, etc. Contact the retailer from whom the watch was purchased.
53
ASTRON 8X22 GPS SOLAR          
FUNCTION LIST/SPECIFICATIONS
8
Index
Functions to adjust the time Functions to charge
GPS signal reception P. 26
Time zone adjustment function …………
P. 1 7
This watch can be set to the precise local time by
just one button operation anywhere in the world.
DST (Daylight Saving Time) can be set manually.
Use this function when you travel to a region
corresponding to another time zone.
Manual time adjustment function ………
P. 2 3
Displays the precise current time of the currently
set time zone by receiving GPS signals from GPS
satellites.
Use this function to adjust the time to the precise
time during normal use.
Automatic time adjustment ……………
P. 2 5
Judges inside the watch the timing suitable for
GPS signal reception from GPS satellites and
automatically starts reception.
Displays the precise current time of the currently
set time zone.
Manual time zone setting …………………
P. 2 2
The time zone of the main-dial can be changed.
DST (Daylight Saving Time) setting ……
P. 1 9
The DST (Daylight Saving Time) of the main-dial
can be set manually.
Solar Charging Function …………………
P. 1 4
A solar cell underneath the dial converts any form
of light into electrical energy to power the watch
and the power is stored in a secondary battery.
Once fully charged, the watch continues to run for
approximately 6 months.
Charging status display function ………
P. 1 3
Roughly displays the energy charged in the watch.
Also shows whether the watch is able to receive
GPS signals.
Power Save Function ………………………
P. 3 1
The Power Save mode can be activated in order
to reduce unnecessary energy consumption when
the watch is left without an adequate light source.
54
ASTRON 8X22 GPS SOLAR          
FUNCTION LIST/SPECIFICATIONS
8
SPECIFICATIONS
Function for reception
Other functions
In-flight mode ( ) …………………………
P. 2 1
Function to prevent the GPS signal reception
function from working. Set this mode when
boarding an airplane, etc.
Satellite acquisition status display function
P. 1 8
Displays by the second hand the number of GPS
satellite from which GPS signals are received
during GPS signal reception.
Reception result display function ………
P. 2 8
Displays the latest reception result (success/
failure).
Time zone setting check function ………
P. 2 6
Displays the currently set time zone
1. Basic function ……………………… Main-dial; three hands (hour/minute/second hands),
date, day display, indicator hand, world time function
(40 Time zones)
2. Frequency of crystal oscillator 32,768 Hz (Hz = Hertz ... Cycles per second)
3. Loss/gain (monthly rate) ………… Loss / gain ±15 seconds on a monthly rate (When the
watch is used without an automatic time setting by
receiving GPS signal and when it is worn on the wrist
within a normal temperature range between 5°C and
35°C (41ºF and 95ºF)).
4. Operational temperature range Between −10°C and +60°C (14ºF and 140ºF)
5. Driving system …………………… Step motor (hour/minute/second hands of main-dial),
date, display, indicator hand.
6. Power source ……………………… Secondary battery, 1 piece
7. Duration of operation …………… Approximately 6 months (Fully charged, and the Power
Save is not activated).
If the Power Save is activated after it is fully charged,
the watch continues to run for approximately 2 years
at maximum.
8. GPS signal reception function Time zone adjustment, manual time adjustment,
automatic time adjustment
9. IC (Integrated Circuit) …………… Oscillator, frequency divider and driving circuit C-MOS-
IC, 4 pieces
Automatic hand position alignment function
P. 4 2
Automatically corrects misalignment when the
hands are misaligned due to external factors such
as magnetic influence.
Automatic leap second reception function
P. 2 7
Automatically receives leap second data when
leap second data reception is necessary.
Copyright ©2016 by SEIKO WATCH CORPORATION
Declaration of Conformity
The specifications are subject to change without prior notice for product improvement.
52

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