Seiko ASTRON 8X22 User manual

8X22 Astron GPS Solar World-Time
Complete User Guide
CONTENTSREAD FIRST
1
ASTRON 8X22 GPS SOLAR 1
¾Length 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.
¾If 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
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 JPower Source P. 38
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.
3
ASTRON 8X22 GPS SOLAR READ FIRST
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
4
ASTRON 8X22 GPS SOLAR READ FIRST
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.
¾DST (Daylight SavingTime) can be set manually.
This watch quickly adjusts the time by receiving GPS
signals from GPS satellites.
JPlace 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
JTime Zone P. 6
When the region or time zone where the watch is used
is changed, please carry out operation of “time zone
adjustment.”
JHow 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.
JHow to charge the watch P. 14
JStandard 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.
JAutomatic time adjustment P. 25
¾This watch is unable to receive GPS signals when the energy
stored in the watch is low.
JCheck the Charging Status P. 13
¾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.
5
ASTRON 8X22 GPS SOLAR READ FIRST
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.)
¾To receive information about a time zone where you
are, it is necessary to adjust the time zone.
JHow to adjust the time zone P. 18
¾Unlike 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.

6
ASTRON 8X22 GPS SOLAR READ FIRST
Time zone
Time zone
Based on Coordinated UniversalTime (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 SavingTime)
Depending on the area, DST (Daylight SavingTime) is individually set.
Daylight SavingTime 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.
¾Daylight SavingTime is subject to change owing to circumstances of the country or region.
Coordinated UniversalTime (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
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.
JTime zone adjustment P. 17
JTime Zone P. 6
JTime 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.”
JHow to manually adjust the time P. 24
JCheck the time zone and DST (Daylight Saving Time) setting P. 20
Los Angeles 7:00 pm on 6th
London
3:00 am on 7th

8
ASTRON 8X22 GPS SOLAR READ FIRST
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 watch’s 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.
JFor details, please refer to “Manual time zone setting” P. 22.
2. Next, adjust the time by manual time adjustment.
JFor 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
¾Display may vary depending on the model.
9
ASTRON 8X22 GPS SOLAR CONTENTS
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 SavingTime) ................................................................ 19
Check the time zone and DST (Daylight SavingTime) 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 PRESERVETHE 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

10
ASTRON 8X22 GPS SOLAR BEFORE USE
Names of the parts
¾Display 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
11
ASTRON 8X22 GPS SOLAR BEFORE USE
Check the charging status. JP. 13
How to charge the watch JP. 14
Hand
position
full middle low
Display
Hand
position ・(OFF) DST (ON)
Display
Hand
position
In-flight mode
() status
Display
In-flight mode ( ) JP. 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] JP. 28
Display of
reception result
Indicator hand display and reception result display
¾Position of each display may differ depending
on the model (design).
Check DST (Daylight Saving Time) JP. 20
Set DST (Daylight Saving Time) JP. 19
Check the reception result JP. 28
Manual time adjustment JP. 23
Time zone adjustment JP. 17
Automatic time adjustment JP. 25
Receive leap second data JP. 27
Continued on the
following page

12
ASTRON 8X22 GPS SOLAR BEFORE USE
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 2Cairo +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 NewYork –5
—•Caracas –4.5
SDQ –4
Santo Domingo
–4
—•St. John’s –3.5
RIO –3 
Rio de Janeiro
–3
FEN –2 Fernando de
Noronha –2
PDL –1 Azores –1
¾The displays of city code and the time difference from UTC are subject to change depending on model.
¾“·” 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 SavingTime) 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
SavingTime) 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] JP. 20
[Time Zone Adjustment] JP. 17
Display of time difference
¾Each time zone is based on data as of March 2015.
13
ASTRON 8X22 GPS SOLAR BEFORE USE
Indicator display Charging status Solution
full
Reception is
allowed.
JP. 15
middle
Reception is
allowed, but keep
in mind to charge
the watch.
About charging
JP. 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 JP. 14
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. JP. 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 JP. 14
5-second
interval
movement
The charging status
is not displayed for
in-flight mode ( ).
Change from in-flight to normal
mode.
JReturn to normal mode ( ) P. 21
When the indicator hand points
to “E,” charge the watch following
the above.
About charging JP. 14
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.
¾GPS signal reception requires a lot of energy. Keep in mind to regularly charge the watch by expose to light. JAbout charging P. 14
Reception is
allowed
Reception is
not allowed

14
ASTRON 8X22 GPS SOLAR BEFORE USE
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.
¾When 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).)
¾When 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.)
JCheck the charging status. P.13
¾The 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.)
• 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 JHow to manually set the time
P. 41
JHow 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
JPlace where GPS signals can be easily
received/Place where GPS signals
cannot be received P. 16
• Receive GPS signals,
set the time zone and
set the time and date
• Set DST (Daylight
SavingTime) as
necessary
JHow to adjust the
time zone P. 18
JSet DST (Daylight
Saving Time) P. 19
Set only the time
JHow to manually
adjust the time
P. 24
<
Setting by GPS signal reception
>
<
Manual setting
>
JCheck the time zone
and DST (Daylight
Saving Time) setting
P. 20
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.)
• 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
¾GPS 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.)
The time zone can be adjusted to the local time anywhere in the
world with just one button operation
¾DST (Daylight SavingTime) can be set manually.
JHow 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.
JHow to manually set the time zone P. 22
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.
¾Failure or success of reception depends on the reception environment.
JPlace where GPS signals can be easily received/Place where GPS signals
cannot be received P. 16
¾Even when the reception is successful, DST (Daylight SavingTime) cannot be
automatically set. Set DST (Daylight SavingTime) manually.
JSet DST (Daylight Saving Time) P. 19
¾GPS 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).”
JHow to charge the watch P. 14
If the charging status is displayed as “E (low),” the reception will not start
even with operation of GPS signal reception.
JCheck the charging status. P. 13

18
ASTRON 8X22 GPS SOLAR BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
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.
JPlace 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
¾Although 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.
JCheck that the reception was
successful P. 28
JCheck the time zone setting P. 17
¾During movement of the date, the buttons
and crown cannot be operated.
¾Manually set DST (Daylight SavingTime).
JSet 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.
J
When the reception
result is displayed as
“N” P. 16
When the second hand has reached the
30-second position, reception is started.
The indicator hand points to “4+.”
¾While 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.
JHow to charge the watch P. 14
Check whether the watch is able/unable to
receive GPS signals
JCheck the charging status P. 13
When the hand points to , deactivate in-flight
mode.
JReturn to normal mode ( ) P. 21
It takes a maximum of
2 minutes to complete
reception.
¾It 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).
¾The larger the
number of acquired
satellites, the easier
it is to receive GPS
signals.
  
  
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
¾Please note that it may be difficult to receive GPS
signals while you are in motion.
¾Even when the hand
points to 4 units or more,
reception may not be
allowed.
¾To 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.)
DST (Daylight Saving Time) can be manually set.
Carry out operation of ①to ③in the state where DST (Daylight SavingTime) setting is ON.
In operation of ②, 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 SavingTime) setting.
<
When DST (Daylight SavingTime) setting is OFF
>
¾In the Lord Howe Island time zone in Australia, the time is advanced by
30 minutes while DST (Daylight SavingTime) is in effect.
This watch corresponds to DST in Lord Howe Island time zone.
¾DST (Daylight SavingTime) is not automatically changed.
¾ON/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 SavingTime) is not adopted from
a region where it is adopted, turn off the DST setting.
012
Pull out
to the first
click
012
Push
back in
012
Press for
3 seconds

20
ASTRON 8X22 GPS SOLAR BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
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
¾To change the time zone setting
• When you are in a place where GPS
signals can be easily received
JHow to adjust the time zone P.18
• When you are in a place where GPS
signals cannot be received
JHow to manually set the time
zone P. 22
¾For 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.12”.
The second hand returns to the time display
mode.
The indicator hand returns to the display of
charging status.
¾Also the current time zone of the main-dial and the DST (Daylight SavingTime) can be checked by just pressing and releasing Button B.
012
Pull out
to the
1st click
012
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.)
Set to in-flight mode ( ).
Return to normal mode ( ).
Carry out operation ①.
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.
JTo set the watch to the local time of the
destination in an airplane, etc. (Manual
time zone setting) P. 22
¾The 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 .
¾When 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.)
The second hand returns to the
time display mode.
The indicator hand returns to
display the charging status.
¾During movement of the date,
the buttons and crown cannot be
operated.
<
Display of the indicator hand
>
Displays ON/OFF setting of DST
(Daylight SavingTime).
¾If DST (Daylight SavingTime) is not
correct, change over ON/OFF with
reference to “Set DST (Daylight Saving
Time) P.19” after operation of ②.
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.
JPlace 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. 12,” to set the watch to the local time and date. ¾Refer to “Set DST (Daylight SavingTime) P. 19,”
to set DST (Daylight SavingTime).
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.
012
Pull out
to the
1st click
012
Push
back in
23
ASTRON 8X22 GPS SOLAR BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
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.)
JHow to manually adjust the time P. 24
JCheck the time zone setting P. 20
Manual time adjustment
¾In 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. JHow to adjust the time zone P. 18
(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.)
¾DST (Daylight SavingTime) is not automatically set. Carry out the setting manually. JSet DST (Daylight SavingTime) P. 19
¾Failure or success of reception depends on the reception environment. JPlace where GPS signals can be easily received/Place
where GPS signals cannot be received P. 16
¾At 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. 25.”
¾GPS 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).” JHow to charge the watch P. 14
(When the charging status becomes “E (low),” the reception will not start even with operation of GPS signal reception.)
JCheck the charging status. P. 13

24
ASTRON 8X22 GPS SOLAR BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
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
¾While 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.
JHow to charge the watch P. 14
JCheck the charging status. P. 13
When the hand points to , deactivate in-flight
mode ( ).
JReturn to normal mode ( ) P. 21
It takes up to one
minute to complete
reception.
¾The 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.”
JPlace 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).
¾To 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.
JWhen the
reception result
is displayed as
“N” P. 16
¾To 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.
J 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.
JCheck the time zone and DST (Daylight
Saving Time) settings P. 20
¾During movement of the date, the buttons
and crown cannot be operated.
¾Manually set DST (Daylight SavingTime).
JSet 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.)
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.
¾In a place without good visibility, GPS signals cannot be received. JPlace where GPS signals can be easily received/Place where GPS signals cannot be
received P. 16
¾If the energy is sufficiently charged, automatic reception will be performed every day.
¾The 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.
¾The 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. 18
<
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.
JHow to manually adjust the time P. 24
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
¾When 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. JHow to charge the watch P. 14
 J Check the charging status P. 13
¾When the energy is reduced, the period for which automatic time adjustment is not performed becomes longer. Keep in mind to charge the watch regularly.
¾If 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
JP. 23
Automatic time
adjustment JP. 25
How to adjust
the time zone
JP. 17
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
JP. 27
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.)
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.
JManual time zone setting P. 22
The watch can be set to all time zones around the world.
Q: Is DST (Daylight SavingTime) automatically changed by
receiving GPS signals?
A: Manually set DST (Daylight SavingTime).
JSet DST (Daylight SavingTime) P. 19
(GPS signals from GPS satellites do not include information
about DST (Daylight SavingTime).)
Even in the same time zone, some countries and regions do not
adopt DST (Daylight SavingTime).
JDST (Daylight SavingTime) P. 12
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) JP. 27.”
27
ASTRON 8X22 GPS SOLAR BASIC OPERATION (HOW TO SET THE TIME/HOW TO RECEIVE GPS SIGNALS, ETC.)
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.
¾The 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).
¾“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.)
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)
¾When Button A is kept pressed, the watch
enters the Manual time adjustment
operation.
¾After 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.
JPlace where GPS signals can be easily
received/Place where GPS signals
cannot be received P. 16
¾When approximately five days have
elapsed after successful reception, the
reception result display becomes “N.”
¾Even 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.
JHow 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.)
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 isY (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.
¾The leap second data is received on or after
December 1st and June 1st.
¾Even when the leap second data reception has
not been successful, the time is correct until
the leap second data is added (deleted).
¾
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
¾After 5 seconds have elapsed or when Button B is
pressed, the watch returns to the time display mode.
¾When Button A is kept pressed,
the watch enters the Manual time
adjustment operation.
¾After 5 seconds have elapsed, or when
Button B is pressed, the watch returns
to the time display mode.
¾When 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
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.
 J How to charge the watch P. 14
(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.)
 J Check the charging status P. 13
(1) Charge the watch until the indicator hand points to the middle
position or full position.
 J Check the charging status P. 13
(2) Carry out time zone adjustment to set the time.
 J How to adjust the time zone P. 18
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. JHow to charge the watch P. 14
¾When 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
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. JP. 13 ~ 14
(2) Carry out time zone adjustment to set the
time. JP. 17 ~ 18
Power Save 2
¾While the watch is being charged, the second hand moves at “5-second intervals”. During the “5-second Interval Movement,” the buttons cannot be operated.
¾If 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
¾The 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
OThe 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.
¾If your watch is rated as “non-water resistant” or “water resistant for daily use,” do not
wash the watch.
Performance and caliber / case number JP. 32
Water resistance JP. 33
OTurn the crown from time to time
• In order to prevent corrosion of the crown, turn the crown from time to
time.
OPress 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. 33
Magnetic resistance
Refer to page P. 34
33
ASTRON 8X22 GPS SOLAR TO PRESERVE THE QUALITY OF YOUR WATCH
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
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.
¾Even 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
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.
OMetallic 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.
OLeather 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).
OPolyurethane 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.
OSilicone 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.

36
ASTRON 8X22 GPS SOLAR TO PRESERVE THE QUALITY OF YOUR WATCH
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.
OHow to wear or take off the watch
OHow to adjust the length of the leather band
¾The 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
37
ASTRON 8X22 GPS SOLAR TO PRESERVE THE QUALITY OF YOUR WATCH
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.
¾In 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
>

38
ASTRON 8X22 GPS SOLAR TO PRESERVE THE QUALITY OF YOUR WATCH
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.
¾Overcharge 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".
¾Refer to "Standard charging time" on page 14 to check the time required for fully
charging the watch.
¾When 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
39
ASTRON 8X22 GPS SOLAR TO PRESERVE THE QUALITY OF YOUR WATCH
After-sale service
ONotes 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.
OReplacement 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.
OInspection 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.