Casio Watch GWM8501 User Manual

MO0807-EA  
Operation Guide 3155  
Getting Acquainted  
Congratulations upon your selection of this CASIO watch. To get the most out of your  
purchase, be sure to read this manual carefully.  
The actual level at which some functions are disabled depends on the watch model.  
Frequent display illumination can run down the battery quickly and require charging.  
The following guidelines give an idea of the charging time required to recover from a  
single illumination operation.  
Approximately 5 minutes exposure to bright sunlight coming in through a window  
Approximately about 8 hours exposure to indoor fluorescent lighting  
Be sure to read “Power Supply” for important information you need to know  
when exposing the watch to bright light.  
Keep the watch exposed to bright light  
The electricity generated by the solar cell of the watch is  
Bright Light  
stored by a built-in battery. Leaving or using the watch  
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where it is not exposed to light causes the battery to run  
down. Make sure the watch is exposed to light as much as  
possible.  
When you are not wearing the watch on your wrist,  
position the face so it is pointed at a source of bright  
light.  
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Solar cell  
If the display of the watch is blank...  
If the display of the watch is blank, it means that the watch’s Power Saving function  
has turned off the display to conserve power.  
You should try to keep the watch outside of your sleeve  
as much as possible. Charging is reduced significantly if  
the face is only partially covered.  
See “Power Saving Function” for more information.  
Note that CASIO COMPUTER CO., LTD. assumes no responsibility for any  
damage or loss suffered by you or any third party arising through the use of this  
product or its malfunction.  
The watch continues to operate, even when it is not exposed to light. Leaving the  
watch in the dark can cause the battery to run down, which will result in some watch  
functions to be disabled. If the battery goes dead, you will have to re-configure watch  
settings after recharging. To ensure normal watch operation, be sure to keep it  
exposed to light as much as possible.  
About This Manual  
Depending on the model of your watch, display text appears either as dark figures  
on a light background or light figures on a dark background. All sample displays in  
this manual are shown using dark figures on a light background.  
Button operations are indicated using the letters shown in the illustration.  
Each section of this manual provides you with the information you need to perform  
operations in each mode. Further details and technical information can be found in  
the “Reference” section.  
Battery charges in the light.  
Battery discharges in the dark.  
Bright Light  
Solar cell  
(Converts light to  
electrical power.)  
Electrical  
energy  
LEVEL 1  
All  
functions  
enabled  
LEVEL 1  
LEVEL 2  
LEVEL 3  
LEVEL 4  
LEVEL 2  
Some or all  
functions  
LEVEL 3  
Dis-  
charge  
LEVEL 4  
disabled  
Charge  
Rechargeable battery  
Rally Mode  
Recall Mode  
World Time Mode  
General Guide  
Press C to change from mode to mode.  
In any mode (except when a setting screen is on the display), press L to illuminate  
the display.  
Timekeeping Mode  
Press C.  
Countdown Timer  
Mode  
Stopwatch Mode  
Alarm Mode  
Radio-controlled Atomic Timekeeping  
This watch receives a time calibration signal and updates its time setting accordingly.  
This watch is designed to pick up the time calibration signals transmitted in Germany  
(Mainflingen), England (Anthorn), the United States (Fort Collins), China  
(Shangqiu), and Japan (Fukushima, Fukuoka/Saga).  
See the maps under “Approximate Reception Ranges” for information about the  
reception ranges of the watch.  
You can disable time signal reception, if you want. See “To turn auto receive on and  
off” for more information.  
Under factory default settings, auto receive is turned off for all of the following city  
codes: MOW (Moscow), HNL (Honolulu), and ANC (Anchorage). For details about  
turning on auto receive for these city codes, see “To turn auto receive on and off”.  
Current Time Setting  
This watch adjusts its time setting automatically in accordance with a time calibration  
signal.You also can perform a manual procedure to set the time and date, when  
necessary.  
Time Calibration Signal Reception  
There are two different methods you can use to receive the time calibration signal:  
auto receive and manual receive.  
The first thing you should do after purchasing this watch is to specify your  
Home City (the city where you normally will use the watch). For more  
information, see “To specify your Home City” below.  
When using the watch outside the areas covered by the time signal transmitters, you  
will have to adjust the current time setting manually as required. See “Timekeeping”  
for more information about manual time settings.  
The U.S. time calibration signal can be picked up by the watch while in North  
America. The term “North America” in this manual refers to the area that consists of  
Canada, the continental United States, and Mexico.  
Auto Receive  
With auto receive, the watch receives the time calibration signal automatically up to 6  
times a day (5 times a day for the Chinese calibration signal). When any auto receive  
is successful, the remaining auto receive operations are not performed. For more  
information, see “About Auto Receive”.  
Manual Receive  
Manual receive lets you start a time calibration receive operation with the press of a  
button. For more information, see “To perform manual receive”.  
To specify your Home City  
1. In the Timekeeping Mode, hold down A until the city  
City code  
Important!  
code starts to flash, which indicates the setting screen.  
2. Press D (east) and B (west) to select the city code  
you want to use as your Home City.  
When getting ready to receive the time calibration signal, position the watch as  
shown in the nearby illustration, with its 12 o’clock side facing towards a window.  
This watch is designed to receive a time calibration signal late at night. Because of  
this, you should place the watch near a window as shown in the illustration when you  
take it off at night. Make sure there are no metal objects nearby.  
LIS, LON : Lisbon, London  
MAD, PAR, ROM, BER, STO : Madrid, Paris,  
Rome, Berlin, Stockholm  
ATH  
MOW  
: Athens  
: Moscow  
Hour : Minutes  
PM indicator Seconds  
HKG, BJS, TPE : Hong Kong, Beijing, Taipei  
SEL, TYO : Seoul, Tokyo  
12 o’clock  
or  
HNL  
ANC  
: Honolulu  
: Anchorage  
YVR, LAX : Vancouver, Los Angeles  
YEA, DEN: Edmonton, Denver  
MEX, CHI : Mexico City, Chicago  
Make sure the watch is facing the right way.  
MIA, YTO, NYC : Miami, Toronto, New York  
Proper signal reception can be difficult or even impossible under the conditions listed  
YHZ  
YYT  
: Halifax  
: St.Johns  
below.  
3. Press A to exit the setting screen.  
Normally, your watch should show the correct time as soon as you select your Home  
City code. If it does not, it should adjust automatically after the next auto receive  
operation (in the middle of the night).You also can perform manual receive or you  
can set the time manually.  
The watch will receive the time calibration signal automatically from the applicable  
transmitter (in the middle of the night) and update its settings accordingly. For  
information about the relationship between city codes and transmitters, see “Time  
Calibration Signal Reception” and “Transmitters”.  
Inside or  
among  
buildings  
Inside a Near household Near a  
vehicle appliances, office construction  
Near high-  
tension  
power lines mountains  
Among or  
behind  
equipment,  
or a mobile  
phone  
site, airport, or  
other sources of  
electrical noise  
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Operation Guide 3155  
To turn auto receive on and off  
Signal Reception Troubleshooting  
1. In the Timekeeping Mode, press D to display the last  
successful receive time and date screen.  
2. Hold down A until the current auto receive setting (ON  
or OFF) starts to flash. This is the setting screen.  
Note that the setting screen will not appear if the  
currently selected Home City is one that does not  
support time calibration reception.  
Check the following points whenever you experience problems with signal reception.  
Problem  
Cannot perform  
manual receive.  
Probable Cause  
The watch is not in the Timekeeping Enter the Timekeeping Mode  
Mode. and try again.  
Your current Home City is not one of Select LIS, LON, MAD, PAR,  
What you should do  
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the following: LIS, LON, MAD, PAR,  
ROM, BER, STO, ATH, MOW, HKG,  
BJS, TPE, SEL, TYO, HNL, ANC,  
YVR, LAX, YEA, DEN, MEX, CHI,  
MIA, YTO, NYC, YHZ, or YYT  
ROM, BER, STO, ATH, MOW,  
HKG, BJS, TPE, SEL, TYO,  
HNL, ANC, YVR, LAX, YEA,  
DEN, MEX, CHI, MIA, YTO,  
NYC, YHZ, or YYT as your  
Home City.  
3. Press D to toggle auto receive on (ON) and off (OFF).  
4. Press A to exit the setting screen.  
On/Off status  
For information about city codes that support signal  
receive, see “To specify your Home City”.  
Auto receive is  
turned on, but the  
settings updated  
indicator does not  
appear on the  
display.  
You changed the time setting  
manually.  
The DST setting was changed  
manually in the World Time Mode.  
You pressed a button while signal  
receive was in progress.  
Perform manual signal receive  
or wait until the next auto  
signal receive operation is  
performed.  
Check to make sure the watch  
is in a location where it can  
receive the signal.  
To check the latest signal reception results  
Press D to view the last successful receive time and  
date. Press D again to return to the previous screen.  
Even if receive is successful, the  
settings updated indicator  
disappears from the display each  
day when the first auto receive  
operation of the day is performed.  
Time data (hour, minutes, seconds)  
only was received during the last  
receive operation. The settings  
updated indicator appears only  
when time data and date data (year,  
month, day) are both received.  
Time setting is  
incorrect following  
signal reception.  
If the time is one hour off, the DST  
setting may be incorrect.  
The Home City code setting is not  
correct for the area where you are  
using the watch.  
Change the DST setting to  
Auto DST.  
Select the correct Home City  
code.  
For further information, see “Important!” under “Time Calibration Signal Reception”  
and “Radio-controlled Atomic Timekeeping Precautions”.  
Rally Mode  
The Rally Mode of your watch can be used to measure special stage elapsed time,  
and to keep track of the goal target time (countdown). The Rally Mode timing  
operation is shown in the illustration below.  
Remaining target time  
(minutes, seconds)  
Special stage elapsed  
time (hours, minutes,  
seconds, 1/10-second)  
Elapsed time  
1/10-second indicator  
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Remaining  
target time  
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(hours:minutes)  
Special stage time  
measurement end  
Goal  
Start point  
Special stage (competitive section 42' 30" 0)  
Target time (0:50)  
Road section (non-competitive 07' 30" 0)  
D Start  
D Stop  
B Record elapsed time  
The watch returns to the reset  
screen automatically when the  
target time becomes zero.  
Special Stage Elapsed Time Measurement  
The special stage elapsed time is measured up to 99 hours, 59 minutes, 59.9  
seconds. If the time exceeds this, timing reverts to zero and continues from there.  
Special StageTiming  
This section describes operations you can perform while  
special stage timing is in progress.  
Target time  
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To pause the current time on the display  
While a special stage timing operation is in progress press  
the D button.  
Before Starting Measurement  
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The watch comes with 10 preset target times (link times),  
LT-05 target time (0:50)  
which you can use as-is or change to the value you want.  
This will pause the current elapsed time (flashing) on the  
display for about one or two minutes. Though the time is  
frozen on the display, the watch continues the special  
stage timing operation (and count down of the remaining  
target time) internally.  
While a time is paused on the display, you can record it  
in memory or reset the timing operation to zero. If you  
don’t do anything, the display will return to the normal  
elapsed time measurement screen after a few minutes.  
You can use the B button to select the target time you  
want while the current target time is reset to its initial  
value.  
LT-01 0:10  
LT-02 0:20  
LT-03 0:30  
LT-04 0:40  
LT-05 0:50  
LT-06 1:00  
LT-07 1:30  
LT-08 2:00  
LT-09 3:00  
LT-10 5:00  
OFF  
Measured elapsed time  
LT-05  
To record the time paused on the display  
To change a target time  
While a time is paused on the display (see above), press the B button.  
This will save the paused time in memory and display the ongoing special stage  
timing operation.  
1. While the current target time is reset to its initial value in  
the Rally Mode, hold down A until the display contents  
start to flash. This is the setting screen.  
2. Use the D (+) and B (–) buttons to select the target  
(link) time you want to change.  
3. Press the C button so the current target time’s hour  
digit starts to flash.  
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The watch has enough memory to store up to 30 measurement time records. If there  
are already 30 records in memory, storing a new measurement time causes the  
oldest record to be deleted automatically to make room for the new one.  
To reset the timing operation to zero  
While a time is paused on the display (see above), hold down the B button.  
This will reset the elapsed time operation to zero.  
4. Use the D (+) and B (–) buttons to change the hour digit value.  
5. Press the C button to move the flashing to the minute digits.  
6. Use the D (+) and B (–) buttons to change the minute digit value.  
7. After the time is setting you want, press the A button to exit the setting screen.  
To cancel an ongoing elapsed time measurement operation  
Hold down the B button to reset the elapsed time operation to zero.  
You can set a target time up to 24 hours, in units of one minute.  
To change screen contents during elapsed time measurement  
Press the B button to display the remaining target time. Note that this operation is not  
available if “OFF” is selected for the target time.  
C
C
Target (link) time  
number  
Target time  
minutes  
Target time hours  
When the remaining target  
time is 5 minutes or more  
When the remaining target time is  
less than 5 minutes  
C
Target  
time  
To start a Rally Mode time measurement  
Press the D button to start the auto start countdown.  
Time measurement (special stage) will start when the  
auto start countdown reaches 00 seconds.  
Target  
time  
Auto start countdown  
seconds indicator  
The watch will beep and display illumination will flash  
whenever the remaining auto countdown time reaches  
50, 40, 30, 20, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 and 0 seconds.  
You can cancel the auto start countdown at any point  
and start time measurement (special stage) manually by  
pressing the D button.  
You can cancel the countdown and return to the  
countdown start screen by pressing the B button while  
a countdown is in progress.  
Remaining Target Time Alert  
The watch will beep and display illumination will flash when the remaining target time  
reaches the following points, 5, 3 and 1 minute, and 30, 10, 5, 4, 3, 2, and 1 second  
before time up, and at time up.  
Remaining auto start  
countdown time  
(36 seconds indicated here)  
3
 
Operation Guide 3155  
Recall Mode  
World Time  
You can use the Recall Mode to view the following data in watch memory.  
Times measured in the Rally Mode  
World Time shows the current time in 48 cities (29 time  
zones) around the world.  
City code  
Total of the measured times currently in memory (TTL)  
The times kept in the World Time Mode are  
synchronized with the time being kept in the  
Timekeeping Mode. If you feel that there is an error in  
any World Time Mode time, check to make sure you  
have the correct city selected as your Home City. Also  
check to make sure that the current time as shown in  
the Timekeeping Mode is correct.  
You can use the D (forward) and B (back) buttons to scroll through records as  
shown below. Holding down either button scrolls the records at high speed.  
Holding down the A button while a record is displayed will show the date and time  
that the measurement was taken.  
To go straight to the total measured time screen, press the D and B buttons at the  
same time.  
How the hour digits are displayed changes (to a format that requires two screens)  
when the total measured time is within the range of 100 hours, 00 minutes and 00  
seconds, to 2999 hours, 59 minutes 57 seconds. While the total measured time is  
displayed in this case, the display will switch automatically between the two screens  
at two-second intervals.  
Select a city code in the World Time Mode to display the  
current time in any particular time zone around the  
globe. See the UTC Differential/City Code Listfor  
information about the UTC differential settings that are  
supported.  
Current time in  
selected city  
B
D
All of the operations in this section are performed in the World Time Mode, which  
you enter by pressing C.  
D
B
D
B
To view the time in another city  
Total measured  
time  
While in the World Time Mode, use the D (eastward) and B (westward) buttons to  
scroll through the city codes (time zones). Holding down either button scrolls at high  
speed.  
Record 30  
Record 1  
Measured elapsed time  
Pressing the D and B buttons at the same time will jump to the UTC time zone.  
To toggle a city code time between Standard Time and Daylight Saving Time  
1. In the World Time Mode, use D and B to display the  
city code (time zone) whose Standard Time/Daylight  
Saving Time setting you want to change.  
Record Number  
Measured  
elapsed time  
A
A
2. Hold down A to toggle between Daylight Saving Time  
(DST indicator displayed) and Standard Time (DST  
indicator not displayed).  
Measurement date and time  
Measurement date  
(Month Day)  
The DST indicator is shown on the World Time Mode  
Measurement time  
(Hour : Minutes)  
screen while Daylight Saving Time is turned on.  
Note that changing the Daylight Saving Time for any city  
code causes the setting to be applied to all city codes,  
except UTC.  
DST indicator  
Total measured time (TTL)  
Total measured  
time  
When the total measured time is in  
the range of zero to 2999 hours,  
59 minutes 57 seconds  
Alarms  
You can set up to five independent multi-function alarms  
with hour, minutes, month, and day. When an alarm is  
turned on, the alarm tone sounds when the alarm time is  
reached. One of the alarms is a snooze alarm, while the  
other four are one-time alarms.  
Alarm number  
Alarm date  
(Month Day)  
Hour digits screen  
You also can turn on an Hourly Time Signal that causes  
the watch to beep twice every hour on the hour.  
There are five alarm screens numbered AL1, AL2,  
AL3 and AL4 for the one-time alarm, a snooze alarm  
screen indicated by SNZ. The Hourly Time Signal  
screen is indicated by SIG.  
Switches automatically at  
two-second intervals  
Switches automatically at  
two-second intervals  
Minute digits screen  
All of the operations in this section are performed in the  
Alarm Mode, which you enter by pressing C.  
Alarm time  
(Hour : Minutes)  
Alarm Types  
To correct recorded times  
The alarm type is determined by the settings you make, as described below.  
You can use the procedure below to correct times recorded by the watch so they  
match official race times. The total measured time value also is updated in accordance  
with the corrected times.  
Daily alarm  
Set the hour and minutes for the alarm time. This type of setting causes the alarm to  
sound everyday at the time you set.  
1. Hold down A until the display contents start to flash.  
This is the setting screen.  
2. Use the D (+) and B () buttons to change the  
measured 1/10-second digit.  
Date alarm  
Set the month, day, hour and minutes for the alarm time. This type of setting causes  
the alarm to sound at the specific time, on the specific date you set.  
3. Press the C button to move the flashing to the  
measured seconds.  
4. Use the D (+) and B () buttons to change the  
measured seconds.  
5. Press the C button to move the flashing to the  
measured minutes.  
6. Use the D (+) and B () buttons to change the  
measured minutes.  
1-Month alarm  
Set the month, hour and minutes for the alarm time. This type of setting causes the  
alarm to sound everyday at the time you set, only during the month you set.  
Monthly alarm  
Set the day, hour and minutes for the alarm time. This type of setting causes the alarm  
to sound every month at the time you set, on the day you set.  
To set an alarm time  
7. Press the C button to move the flashing to the  
measured hours.  
1. In the Alarm Mode, use D to scroll through the alarm  
screens until the one whose time you want to set is  
displayed.  
8. Use the D (+) and B () buttons to change the measured hours.  
9. After the time is what you want, press the A button to exit the setting screen.  
You can change a measured time to a value up to 99 hours, 59 minutes, 59.9  
seconds.  
Holding down the D (+) or B () button will scroll the selected value at high speed.  
To reset the data to all zeros, press the D and B buttons at the same time.  
C
C
C
C
Measured  
1/10 second  
Measured  
seconds  
Measured  
minutes  
Measured  
hours  
To set a one-time alarm, display an alarm screen AL1, AL2, AL3 and AL4.  
To set the snooze alarm, display the SNZ screen.  
The snooze alarm repeats every five minutes.  
2. After you select an alarm, hold down A until the hour setting of the alarm time  
starts to flash, which indicates the setting screen.  
This operation turns on the alarm automatically.  
3. Press C to move the flashing in the sequence shown below to select other  
settings.  
To delete all memory records  
You can use the following procedure to clear all of the  
measurement data records currently stored in watch  
memory.  
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1. Use the D and B button to display the total  
measurement time screen.  
2. Hold down A until the display contents start to flash.  
This is the setting screen.  
Hour  
Minutes  
Month  
Day  
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3. Press the D (+) and B () buttons at the same time to  
delete the records.  
4. Press the A button to exit the setting screen.  
4. While a setting is flashing, use D and B to change it as described below.  
Screen To do this: Do this:  
L
Change the hour Use D (+) and B ().  
and minutes  
With the 12-hour format, set the time correctly  
as a.m. or p.m. (P indicator).  
To set an alarm that does not include a month  
and/or day, set for each setting.  
Change the month  
and day  
5. Press A to exit the setting screen.  
4
 
Operation Guide 3155  
3. When the setting you want to change is flashing, use D and B to change it as  
Alarm Operation  
described below.  
The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the  
watch is in. In the case of the snooze alarm, the alarm operation is performed a total  
of seven times, every five minutes, until you turn the alarm off.  
Alarm and Hourly Time Signal operations are performed in accordance with the  
Timekeeping Mode time.  
Setting  
Screen  
Button Operation  
Hours, Minutes  
Use D (+) and B () to change the setting.  
To stop the alarm tone after it starts to sound, press any button.  
Performing any one of the following operations during a 5-minute interval between  
snooze alarms cancels the current snooze alarm operation.  
Displaying the Timekeeping Mode setting screen  
To specify a countdown start time of 24 hours, set  
4. Press A to exit the setting screen.  
.
To use the countdown timer  
Displaying the SNZ setting screen  
Press D while in the Countdown Timer Mode to start the  
countdown timer.  
Timer start time  
Seconds  
To test the alarm  
In the Alarm Mode, hold down D to sound the alarm.  
The countdown timer operation continues even if you  
exit the Countdown Timer Mode.  
Press D while a countdown operation is in progress to  
pause it. Press D again to resume the countdown.  
To stop a countdown operation completely, first pause it  
(by pressing D), and then press B. This returns the  
countdown time to its starting value.  
To turn an alarm on and off  
1. In the Alarm Mode, use D to select an alarm.  
2. Press B to toggle it on and off.  
Turning on a alarm (AL1, AL2, AL3, AL4 or  
SNZ) displays the alarm on indicator (  
Alarm Mode screen.  
) on its  
In all modes, the alarm on indicator is shown for any  
alarm that is currently turned on.  
Current timer time  
ON  
Alarm on  
indicator  
Snooze alarm  
indicator  
The alarm on indicator flashes while the alarm is  
sounding.  
The snooze alarm indicator (  
snooze alarm is sounding and during the 5-minute  
intervals between alarms.  
Illumination  
) flashes while the  
This watch has an EL (electro-luminescent) panel that  
causes the entire display to glow for easy reading in the  
dark. The watchs auto light switch turns on illumination  
automatically when you angle the watch towards your  
face.  
The auto light switch must be turned on (indicated by  
the auto light switch on indicator) for it to operate.  
See Illumination Precautionsfor other important  
information about using illumination.  
To turn the Hourly Time Signal on and off  
1. In the Alarm Mode, use D to select the Hourly Time  
Signal (SIG).  
2. Press B to toggle it on and off.  
The Hourly Time Signal on indicator (  
) is shown  
on the display in all modes while this function is turned  
on.  
To illuminate the display manually  
Auto light switch  
on indicator  
In any mode, press L to turn on illumination.  
The above operation turns on illumination regardless of  
the current auto light switch setting.  
Hourly time signal  
on indicator  
You can use the procedure below to select either 1.5 seconds or 3 seconds as the  
illumination duration. When you press L, the illumination will remain on for about  
1.5 seconds or 3 seconds, depending on the current illumination duration setting.  
Stopwatch  
The stopwatch lets you measure elapsed time, split times,  
and two finishes.  
The display range of the stopwatch is 23 hours, 59  
minutes, 59.99 seconds.  
The stopwatch continues to run, restarting from zero  
after it reaches its limit, until you stop it.  
The stopwatch measurement operation continues even  
if you exit the Stopwatch Mode.  
Hours  
To specify the illumination duration  
1. In the Timekeeping Mode, hold down A until the  
display contents start to flash. This is the setting screen.  
2. Press the C button three times to move the flashing to  
the seconds.  
3. While the seconds are flashing, press B to toggle the  
setting between 1.5 seconds ( ) and 3 seconds (  
).  
Exiting the Stopwatch Mode while a split time is frozen  
on the display clears the split time and returns to  
elapsed time measurement.  
4. Press A to exit the setting screen.  
Minutes  
1/100 second  
Seconds  
All of the operations in this section are performed in the  
Stopwatch Mode, which you enter by pressing C.  
About the Auto Light Switch  
Turning on the auto light switch causes illumination to turn on, whenever you position  
your wrist as described below in any mode. Note that this watch features a Full Auto  
EL Light,so the auto light switch operates only when available light is below a certain  
level. It does not turn on the backlight under bright light.  
To measure times with the stopwatch  
Elapsed Time  
D
D  
Stop  
D  
Re-start  
D  
Stop  
B  
Clear  
Start  
Moving the watch to a position that is parallel to the ground and then tilting it towards  
you more than 40 degrees causes illumination to turn on.  
Wear the watch on the outside of your wrist.  
Split Time  
D
Start  
B  
Split  
B  
Split release  
D  
Stop  
B  
Clear  
(SPL displayed)  
Parallel to  
ground  
Two Finishes  
More than 40°  
D
B  
D  
Stop  
B  
Split release  
B  
Clear  
Start  
Split  
First runner finishes. Second runner  
Display time of first  
runner.  
Display time of  
second runner.  
finishes.  
Warning!  
Always make sure you are in a safe place whenever you are reading the  
display of the watch using the auto light switch. Be especially careful when  
running or engaged in any other activity that can result in accident or injury.  
Also take care that sudden illumination by the auto light switch does not  
startle or distract others around you.  
When you are wearing the watch, make sure that its auto light switch is turned  
off before riding a bicycle or operating a motorcycle or any other motor  
vehicle. Sudden and unintended operation of the auto light switch can create a  
distraction, which can result in a traffic accident and serious personal injury.  
Countdown Timer  
You can set the countdown timer within a range of one  
minute to 24 hours. An alarm sounds when the countdown  
reaches zero.  
All of the operations in this section are performed in the  
Countdown Timer Mode, which you enter by pressing  
C.  
Hours Seconds  
Minutes  
To turn the auto light switch on and off  
Configuring the Countdown Timer  
The following are the settings you should configure before  
actually using the countdown timer.  
In the Timekeeping Mode, hold down L for about three seconds to toggle the auto  
light switch on (A.EL displayed) and off (A.EL not displayed).  
The auto light switch on indicator (A.EL) is on the display in all modes while the auto  
light switch is turned on.  
Countdown start time  
See To configure the countdown timerfor information  
about setting up the timer.  
Power Supply  
Countdown End Beeper  
The countdown end beeper lets you know when the countdown reaches zero. The  
beeper stops after about 10 seconds or when you press any button.  
This watch is equipped with a solar cell and a special rechargeable battery (secondary  
battery) that is charged by the electrical power produced by the solar cell. The  
illustration shown below shows how you should position the watch for charging.  
To configure the countdown timer  
Example: Orient the watch so its face is  
pointing at a light source.  
The illustration shows how to position  
a watch with a resin band.  
Note that charging efficiency drops  
when any part of the solar cell is  
blocked by clothing, etc.  
You should try to keep the watch  
outside of your sleeve as much as  
possible. Charging is reduced  
significantly if the face is covered only  
partially.  
Solar cell  
1. While the countdown start time is on the display in the  
Countdown Timer Mode, hold down A until the current  
countdown start time starts to flash, which indicates the  
setting screen.  
If the countdown start time is not displayed, use the  
procedure under To use the countdown timerto  
display it.  
2. Press C to move the flashing in the sequence shown  
below to select other settings.  
Hours  
Minutes  
5
 
Operation Guide 3155  
Important!  
Recovery Times  
Storing the watch for long periods in an area where there is no light or wearing it in  
such a way that it is blocked from exposure to light can cause rechargeable battery  
power to run down. Be sure that the watch is exposed to bright light whenever  
possible.  
The table below shows the amount exposure that is required to take the battery from  
one level to the next.  
Exposure Level  
(Brightness)  
Approximate Exposure Time  
Level 5 Level 4 Level 3  
Level 2  
Level 1  
This watch uses a special rechargeable battery to store power produced by the solar  
cell, so regular battery replacement is not required. However, after very long use, the  
rechargeable battery may lose its ability to achieve a full charge. If you experience  
problems getting the special rechargeable battery to charge fully, contact your dealer  
or CASIO distributor about having it replaced.  
Never try to remove or replace the watchs special battery yourself. Use of the wrong  
type of battery can damage the watch.  
All data stored in memory is deleted, and the current time and all other settings  
return to their initial factory defaults whenever battery power drops to Level 5 and  
when you have the battery replaced.  
Turn on the watchs Power Saving function and keep it in an area normally exposed  
to bright light when storing it for long periods. This helps to keep the rechargeable  
battery from going dead.  
Outdoor Sunlight  
(50,000 lux)  
Sunlight Through a Window  
(10,000 lux)  
Daylight Through a Window  
on a Cloudy Day (5,000 lux)  
Indoor Fluorescent Lighting  
(500 lux)  
2 hours  
6 hours  
26 hours  
129 hours  
263 hours  
- - - - - - - -  
7 hours  
36 hours  
73 hours  
- - - - - - - -  
11 hours  
118 hours  
The above exposure time values are all for reference only. Actual required exposure  
times depend on lighting conditions.  
Battery Power Indicator and Recover Indicator  
The battery power indicator on the display shows you the current status of the  
rechargeable batterys power.  
Timekeeping  
Current Time  
Press the B button to toggle the lower display between  
the day of the week and date, and the currently selected  
World Time city and time (Dual Time).  
Level Battery Power Indicator  
Function Status  
Day of Seconds  
week  
Month Day  
1
All functions enabled.  
Use the Timekeeping Mode to set and view the current  
time and date.  
2
All functions enabled.  
3
4
5
l
Auto and manual receive,  
illumination, and beeper  
disabled.  
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PM  
Hour : Minutes  
Seconds  
indicator  
(Charge Soon Alert)  
L
Battery power  
indicator  
B
BL  
Except for timekeeping and  
the C (charge) indicator, all  
functions and display  
indicators disabled.  
All functions disabled.  
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Dual Time  
l
c
Dual time  
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City code  
The flashing LOW indicator at Level 3 tells you that battery power is very low, and  
that exposure to bright light for charging is required as soon as possible.  
At Level 5, all functions are disabled and settings return to their initial factory  
defaults. Once the battery reaches Level 2 after falling to Level 5, reconfigure the  
current time, date, and other settings.  
The watchs Home City code setting will change automatically to TYO (Tokyo)  
whenever the battery drops to Level 5. With this Home City code setting, the watch is  
configured to receive the time calibration signals of Japan. If you are using the watch  
in North America or Europe, or China you will need to change the Home City code  
setting to match your location whenever the battery drops to Level 5.  
Display indicators reappear as soon as the battery is charged from Level 5 to Level  
2.  
Read This BeforeYou Set the Time and Date!  
This watch is preset with a number of city codes, each of which represents the time  
zone where that city is located. When setting the time, it is important that you first  
select the correct city code for your Home City (the city where you normally use the  
watch). If your location is not included in the preset city codes, select the preset city  
code that is in the same time zone as your location.  
Note that all of the times for the World Time Mode city codes are displayed in  
accordance with the time and date settings you configure in the Timekeeping Mode.  
To set the time and date manually  
Leaving the watch exposed to direct sunlight or some other very strong light source  
can cause the battery power indicator to show a reading temporarily that is higher  
than the actual battery level.The correct battery level should be indicated after a few  
minutes.  
1. In the Timekeeping Mode hold down A until the city  
code starts to flash, which indicates the setting screen.  
l
2. Use D and B to select the city code you want.  
Make sure you select your Home City code before  
changing any other setting.  
Performing illumination, or beeper operations during a  
short period may cause  
(recover) to appear on the  
display. Illumination, alarm, countdown timer alarm, and  
hourly time signal will be disabled until battery power  
recovers.  
After some time, battery power will recover and  
(recover) will disappear, indicating that the above  
functions are enabled again.  
For full information on city codes, see the UTC Differential/City Code List.  
3. Press C to move the flashing in the sequence shown below to select the other  
setting.  
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12/24-Hour  
DST  
Day  
Seconds  
Year  
Hour  
City Code  
Format  
If  
(recover) appears frequently, it probably means  
that remaining battery power is low. Leave the watch in  
bright light to allow it to charge.  
Power Saving  
Month  
Minutes  
Recover indicator  
The following steps explain how to configure timekeeping settings only.  
4. When the timekeeping setting you want to change is flashing, use D or B to  
change it as described below.  
Charging Precautions  
Certain charging conditions can cause the watch to become very hot. Avoid leaving  
the watch in the areas described below whenever charging its rechargeable battery.  
Also note that allowing the watch to become very hot can cause its liquid crystal  
display to black out. The appearance of the LCD should become normal again when  
the watch returns to a lower temperature.  
Screen:  
To do this:  
Do this:  
Change the city code  
Use D (east) and B  
(west).  
Cycle between Auto DST (AvtA), Daylight Press D.  
Saving Time (ON) and Standard Time  
(OFF).  
Warning!  
Leaving the watch in bright light to charge its rechargeable battery can cause it  
to become quite hot.Take care when handling the watch to avoid burn injury.  
The watch can become particularly hot when exposed to the following  
conditions for long periods.  
Toggle between 12-hour (  
hour ( ) timekeeping  
Reset the seconds to  
) and 24-  
Press D.  
On the dashboard of a car parked in direct sunlight  
Press D.  
Press B.  
Too close to an incandescent lamp  
Toggle the display illumination duration  
between 1.5 and 3 seconds  
Under direct sunlight  
Change the hour and minutes  
Use D (+) and B ().  
Charging Guide  
After a full charge, timekeeping remains enabled for up to about seven months.  
The following table shows the amount of time the watch needs to be exposed to light  
each day in order to generate enough power for normal daily operations.  
Change the year, month, or day  
Toggle between Power Saving on ( ) and Press D.  
off (  
Exposure Level (Brightness)  
Approximate  
ExposureTime  
)
Outdoor Sunlight (50,000 lux)  
5 minutes  
5. Press A to exit the setting screen.  
Auto DST (AvtA) can be selected only while LIS, LON, MAD, PAR, ROM,  
BER, STO, ATH, MOW, TPE, SEL, TYO, HNL, ANC, YVR, LAX, YEA,  
DEN, MEX, CHI, MIA, YTO, NYC, YHZ, or YYT is selected as the Home  
City code. For more information, see Daylight Saving Time (DST)below.  
The day of the week is displayed automatically in accordance with the date (year,  
month, and day) settings.  
Sunlight Through a Window (10,000 lux)  
Daylight Through a Window on a Cloudy Day (5,000 lux)  
Indoor Fluorescent Lighting (500 lux)  
24 minutes  
48 minutes  
8 hours  
Since these are the specs, we can include all the technical details.  
Watch not exposed to light  
Internal timekeeping  
12-hour and 24-hour timekeeping  
Display on 18 hours per day, sleep state 6 hours per day  
1 illumination operation(1.5 second) per day  
10 seconds of alarm operation per day  
With the 12-hour format, the P (PM) indicator appears to the left of the hour digits for  
times in the range of noon to 11:59 p.m. and no indicator appears to the left of the  
hour digits for times in the range of midnight to 11:59 a.m.  
With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without  
any indicator.  
Measurement of 26 Rally Mode stages per month  
Approximately 4 minutes of signal reception per day  
Stable operation is promoted by frequent exposure to light.  
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is  
applied in all other modes.  
6
 
Operation Guide 3155  
To turn Power Saving on and off  
Daylight SavingTime (DST)  
1. In the Timekeeping Mode, hold down A until the city  
code starts to flash, which indicates the setting screen.  
2. Press C nine times until the Power Saving on/off  
screen appears.  
Daylight Saving Time (summer time) advances the time setting by one hour from  
Standard Time. Remember that not all countries or even local areas use Daylight  
Saving Time.  
The time calibration signals transmitted from Mainflingen (Germany), Anthorn  
(England), or Fort Collins (the United States) include both Standard Time and DST  
data. When the Auto DST setting is turned on, the watch switches between Standard  
Time and DST (summer time) automatically in accordance with the signals.  
Though the time calibration signal transmitted by the Fukushima and Fukuoka/Saga,  
Japan transmitters include summer time data, summer time currently is not  
implemented in Japan (as of 2007).  
The default DST setting is Auto DST (AvtA) whenever you select LIS, LON,  
MAD, PAR, ROM, BER, STO, ATH, MOW, TYO, ANC, YVR, LAX, YEA,  
DEN, MEX, CHI, MIA, YTO, NYC, YHZ, or YYT as your Home City code.  
If you experience problems receiving the time calibration signal in your area, it  
probably is best to switch between Standard Time and Daylight Saving Time  
(summer time) manually.  
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3. Press D to toggle Power Saving on ( ) and off  
(
).  
4. Press A to exit the setting screen.  
On/Off status  
The Power Saving indicator (PS) is on the display in all  
modes while Power Saving is turned on.  
Radio-controlled Atomic Timekeeping Precautions  
Strong electrostatic charge can result in the wrong time being set.  
The time calibration signal bounces off the ionosphere. Because of this, such factors  
as changes in the reflectivity of the ionosphere, as well as movement of the  
ionosphere to higher altitudes due to seasonal atmospheric changes or the time of  
day may change the reception range of the signal and make reception temporarily  
impossible.  
To change the Daylight Saving Time (summer time) setting  
1. In the Timekeeping Mode, hold down A until the city  
code starts to flash, which indicates the setting screen.  
2. Press C and the DST setting screen appears.  
3. Use D to cycle through the DST settings in the  
sequence shown below.  
Even if the time calibration signal is received properly, certain conditions can cause  
the time setting to be off by up to one second.  
The current time setting in accordance with the time calibration signal takes priority  
over any time settings you make manually.  
The watch is designed to update the date and day of the week automatically for the  
period January 1, 2000 to December 31, 2099. Setting of the date by the time  
calibration signal cannot be performed starting from January 1, 2100.  
This watch can receive signals that differentiate between leap years and non-leap  
years.  
Though this watch is designed to receive both time data (hour, minutes, seconds)  
and date data (year, month, day), certain signal conditions can limit reception to time  
data only.  
If you are in an area where proper time calibration signal reception is impossible, the  
watch keeps time within 15 seconds a month at normal temperature.  
If you have problems with proper time calibration signal reception or if the time  
setting is wrong after signal reception, check your current city code, DST (summer  
time), and auto receive settings.  
Auto DST (  
)
DST off (  
)
DST on ( )  
ON  
AvtA  
OFF  
DST indicator  
If you change your Home City to one that is within the same transmitter area, the  
current DST setting will be retained. If you change to a city that is outside your  
current transmitter area, DST will be turned off automatically.  
Transmitter area city codes  
TYO, TPE, and SEL  
HKG, BJS  
HNL, ANC, LAX, DEN, CHI, NYC, YVR, YEA, MEX, MIA, YTO,  
YHZ, and YYT  
The Home City setting reverts to the initial default of TYO (Tokyo) whenever the  
battery power level drops to Level 5 or when you have the rechargeable battery  
replaced. If this happens, change the Home City to the setting you want.  
LON, PAR, BER, ATH, LIS, MAD, ROM, STO, and MOW  
All other city codes  
4. When the setting you want is selected, press A to exit the setting screen.  
The DST indicator appears to indicate that Daylight Saving Time is turned on.  
Transmitters  
The time calibration signal received by this watch depends on the currently  
selected Home City code.  
When a U.S. time zone is selected, the watch receives the time calibration signal  
transmitted from the United States (Fort Collins).  
Reference  
This section contains more detailed and technical information about watch operation.  
It also contains important precautions and notes about the various features and  
functions of this watch.  
When a Japanese time zone is selected, the watch receives the time calibration  
signal transmitted from Japan (Fukushima and Fukuoka/Saga).  
When a European time zone is selected, the watch receives the time calibration  
signals transmitted from Germany (Mainflingen) and England (Anthorn).  
When a China time zone is selected, the watch receives the time calibration signals  
transmitted from China (Shangqiu City).  
When your Home City is LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW  
(which can receive both the Anthorn and Mainflingen signals), the watch first tries to  
pick up the signal it last successfully received. If that fails, it tries the other signal. For  
the first receive after you select your Home City, the watch tries the nearest signal  
first (Anthorn for LIS, LON, Mainflingen for MAD, PAR, ROM, BER, STO, ATH, and  
MOW).  
Graphic Area  
The information shown in the graphic area depends on the current mode.  
Graphic Area  
Mode  
Timekeeping Mode  
Rally Mode  
Graphic Area  
Timekeeping Mode seconds  
Target time number/Measurement time  
1/10 seconds during measurement  
Record number  
Timekeeping Mode seconds  
No indication  
Stopwatch Mode 1/10 seconds  
Recall Mode  
World Time Mode  
Alarm Mode  
Stopwatch Mode  
CountdownTimer Mode CountdownTimer Mode seconds  
Auto Return Features  
If you leave a screen with flashing digits on the display for two or three minutes  
without performing any operation, the watch exits the setting screen automatically.  
Button Operation Tone  
Scrolling  
The button operation tone sounds any time you press one  
of the watchs buttons.You can turn the button operation  
tone on or off as desired.  
Even if you turn off the button operation tone, the  
alarms, the Hourly Time Signal, the countdown alarm,  
and Rally Mode auto start all operate normally.  
The B and D buttons are used in various modes and setting screens to scroll  
through data on the display. In most cases, holding down these buttons during a scroll  
operation scrolls at high speed.  
Initial Screens  
When you enter the Rally Mode, Recall Mode, World Time Mode, or Alarm Mode, the  
data you were viewing when you last exited the mode appears first.  
To turn the button operation tone on and off  
Timekeeping  
In any mode (except when a setting screen is on the display), hold down C to toggle  
the button operation tone on ( not displayed) and off ( displayed).  
Holding down C to turn the button operation tone on or off also causes the watchs  
current mode to change.  
Resetting the seconds to 00 while the current count is in the range of 30 to 59  
causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are  
reset to 00 without changing the minutes.  
The year can be set in the range of 2000 to 2099.  
The indicator is displayed in all modes when the button operation tone is turned  
off.  
The watchs built-in full automatic calendar makes allowances for different month  
lengths and leap years. Once you set the date, there should be no reason to change  
it except after you have the watchs battery replaced.  
Power Saving Function  
When turned on, the Power Saving function enters a sleep  
The current time for all city codes in the Timekeeping Mode and World Time Mode is  
calculated in accordance with the Coordinated Universal Time (UTC) for each city,  
based on your Home City time setting.  
Power saving indicator  
state automatically whenever the watch is left in an area  
for a certain period where it is dark. The table below  
shows how watch functions are affected by the Power  
Saving function.  
World Time  
The seconds count of the World Time is synchronized with the seconds count of the  
Timekeeping Mode.  
ElapsedTime in  
Dark  
Display  
Operation  
Illumination Precautions  
The electro-luminescent panel that provides illumination loses power after very long  
use.  
60 to 70 minutes Blank, with Power Saving All functions enabled, except for the  
indicator (PS) flashing display  
6 or 7 days  
Illumination may be hard to see when viewed under direct sunlight.  
The watch may emit an audible sound whenever the display is illuminated. This is  
due to vibration of the EL panel used for illumination, and does not indicate  
malfunction.  
Blank, with Power Saving Auto receive, beeper tone,  
indicator (PS) not flashing illumination, and display are disabled.  
Wearing the watch inside the sleeve of clothing can cause it to enter the sleep state.  
The watch will not enter the sleep state between 6:00 AM and 9:59 PM. If the watch  
is already in the sleep state when 6:00 AM arrives, however, it will remain in the  
sleep state.  
Illumination turns off automatically whenever an alarm sounds.  
Frequent use of illumination runs down the battery.  
Auto light switch precautions  
Avoid wearing the watch on the inside of your wrist. Doing so causes the auto light  
switch to operate when it is not needed, which shortens battery life. If you want to  
wear the watch on the inside of your wrist, turn off the auto light switch feature.  
To recover from the sleep state  
Perform any one of the following operations.  
Move the watch to a well-lit area.  
Press any button.  
More than 15 degrees  
too high  
Illumination may not turn on if the face of the watch is  
more than 15 degrees above or below parallel. Make  
sure that the back of your hand is parallel to the ground.  
Illumination turns off after a preset amount of time (1.5  
or 3 seconds), even if you keep the watch pointed  
towards your face.  
Angle the watch towards your face for reading.  
7
 
Operation Guide 3155  
Static electricity or magnetic force can interfere with proper operation of the auto  
light switch. If illumination does not turn on, try moving the watch back to the starting  
position (parallel with the ground) and then tilt it back toward you again. If this does  
not work, drop your arm all the way down so it hangs at your side, and then bring it  
back up again.  
Under certain conditions, illumination may not turn on until about one second after  
you turn the face of the watch towards you. This does not necessarily indicate  
malfunction of the auto light switch.  
You may notice a very faint clicking sound coming from the watch when it is shaken  
back and forth. This sound is caused by mechanical operation of the auto light  
switch, and does not indicate a problem with the watch.  
UTC Differential/City Code List  
City  
Code  
PPG  
UTC  
Differential  
11.0  
10.0  
09.0  
City  
Pago Pago  
Honolulu  
Anchorage  
Vancouver  
Los Angeles  
Edmonton  
Denver  
HNL  
ANC  
YVR  
LAX  
YEA  
DEN  
MEX  
CHI  
08.0  
07.0  
06.0  
Mexico City  
Chicago  
MIA  
Miami  
YTO  
NYC  
SCL  
YHZ  
YYT  
Toronto  
05.0  
New York  
Santiago  
Halifax  
04.0  
St. Johns  
03.5  
03.0  
01.0  
RIO Rio De Janeiro  
RAI  
UTC  
LIS  
Praia  
Lisbon  
London  
Madrid  
Paris  
Rome  
Berlin  
Stockholm  
Athens  
Cairo  
Jerusalem  
Moscow  
Jeddah  
Tehran  
Dubai  
+00.0  
LON  
MAD  
PAR  
ROM  
BER  
STO  
ATH  
CAI  
JRS  
MOW  
JED  
THR  
DXB  
KBL  
KHI  
DEL  
DAC  
RGN  
BKK  
SIN  
HKG  
BJS  
TPE  
SEL  
TYO  
ADL  
GUM  
SYD  
NOU  
WLG  
+01.0  
+02.0  
+03.0  
+03.5  
+04.0  
+04.5  
+05.0  
+05.5  
+06.0  
+06.5  
+07.0  
Kabul  
Karachi  
Delhi  
Dhaka  
Yangon  
Bangkok  
Singapore  
Hong Kong  
Beijing  
Taipei  
+08.0  
Seoul  
Tokyo  
+09.0  
+09.5  
Adelaide  
Guam  
Sydney  
Noumea  
Wellington  
+10.0  
+11.0  
+12.0  
Based on data as of March 2008.  
The rules governing global times (GMT differential and UTC offset) and summer  
time are determined by each individual country.  
8
 

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