Casio GA100-1A1 Operation Manual

MO0911-EA

Operation Guide 5081

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.

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.

General Guide

• Press C to change from mode to mode.

• In any mode (except a setting mode), press B to illuminate the display.

Timekeeping Mode

Press C.

• 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.

Stopwatch Mode

▲

Alarm Mode

Countdown Timer Mode

▲

World Time Mode

▲

Timekeeping

You can adjust the Home Time city date and time in the Timekeeping Mode.

• Pressing D in the Timekeeping Mode will toggle lower left display between the screens shown below.

Home City Date Home City Time

Day of the week

▲

Date Seconds

To set the time and date

City code

Hour Minutes

City Code

Illumination

Duration

Seconds

PM indicator

3. Press C to change the flashing screen content in the sequence shown below to

select the other setting.

4. When the timekeeping setting you want to change is flashing, use D or B to

change it as described below.

5. Press A to exit the setting mode.

• The day of the week is displayed automatically in accordance with the date (year, month, and day) settings.

1. In the Timekeeping Mode, hold down A for about three

seconds until the city code flashes on the lower right display. This is the setting mode.

2. Use D and B to select the city code you want.

To do this: Do this:Screen:

Change the city code

Toggle the DST setting between Daylight Saving Time ( Standard Time (

Toggle between 12-hour ( ) and 24-hour ( ) timekeeping

Reset the seconds to

Change the hour and minutes

Change the year, month, or day

Toggle the display illumination duration between 1.5 seconds ( and three seconds (

• Make sure you select your Home City code before

changing any other setting.

• For full information on city codes, see the “City Code Table”.

Day

12/24-Hour

Format

DST

Month

)

) and

Day of the week

▲

)

SecondsPM indicator

Hour Minutes

Seconds

Year

Use D (east) and B (west).

Press D.

Use D (+) and B (–).

Press D.

Minutes

Hour

▲

Daylight Saving Time (DST)

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.

To change the Daylight Saving Time (summer time) setting

DST indicator

12-hour and 24-hour timekeeping

• With the 12-hour format, the PM indicator appears above the hour digits for times in the range of noon to 11:59 p.m. and no indicator appears 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 the PM indicator.

• The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is applied in all other modes.

1. In the Timekeeping Mode, hold down A for about three

seconds until the city code flashes on the lower right display. This is the setting mode.

2. Press C. This will display the DST setting screen.

3. Use D to toggle the DST setting on and off.

DST off ( ) DST on ( )

• The default DST setting is OFF ( ).

4. When the setting you want is selected, press A to exit

the setting mode.

• The DST indicator appears to indicate that Daylight Saving Time is turned on.

▲

Stopwatch

Speed hand

Important!

• Check to make sure that the speed hand is not moving before you perform any Stopwatch Mode button operation.

Specifying a Distance Value

You can use the procedure below to specify a distance value, if you want. If you specify a distance value, the watch will calculate and indicate speed for certain stopwatch operations.

• The distance value represents kilometers, miles, or any other distance unit you want. Specifying a distance value of 10.0, for example, can mean 10.0 kilometers or 10.0 miles.

• No speed calculation is performed when 0.0 is specified as the current distance value.

• For lap time readings, you can specify either the lap distance (when all the laps are the same distance) or the total race distance.

• For split time readings, you can specify the total race distance only. Though the watch will indicate a speed each time you take a split reading, they will be based on the total race distance, and so they will not indicate actual intermediate split speeds.

You can use the stopwatch to measure elapsed time, lap times and split times. If you specify a distance value, the stopwatch also will calculate and display speeds.

• The digital display range of the stopwatch is 99 hours, 59 minutes, 59.999 seconds. The stopwatch continues to run until you stop it. If it reaches the above limit, it will restart the time measurement from zero.

• The stopwatch operation continues even if you exit the Stopwatch Mode. If you exit the Stopwatch Mode while a stopwatch operation is in progress, the segments in the upper right dial will appear and disappear sequentially as stopwatch seconds are counted. This is to let you know that a stopwatch operation is in progress.

• All of the operations in this section are performed in the Stopwatch Mode, which you enter by pressing C.

Operation Guide 5081

To specify a distance value

How speed is indicated

Speed hand

OVER

Mach (MACH)

Speed (1000)

Time Measurement

You need to specify either lap time or split time measurement before you start a stopwatch operation.

• If you want to measure total elapsed time, select split time measurement.

To specify lap time or split time readings

1. In the Stopwatch Mode, make sure the stopwatch is stopped and reset to all zeros.

• Make sure that display.

• If you need to reset the stopwatch to all zeros, press A.

2. Press A to toggle between

display.

1. In the Stopwatch Mode, make sure the stopwatch is stopped and reset to all zeros.

• If you need to reset the stopwatch to all zeros, press A.

2. Hold down A for about three seconds until the watch beeps, DIST ( and the left digit of the current distance value setting flashes in the lower left display.

• This is the distance value setting mode.

3. Press C to move the flashing between the values on the left side and right side of the distance value digit decimal point.

4. While either the left or right distance value is flashing, use D (+) and B (–) to change it.

• You can specify a distance value in the range of 0.1 to

99.9.

5. After specifying the distance value you want, press A to exit the setting mode.

• While an elapsed time measurement operation is being

performed in the Stopwatch Mode, the watch will display

Upper

a speed value, which is calculated based on the

right dial

distance you specified and the elapsed time. The speed is indicated by the upper right dial, two indicators (1000 and MACH), and the speed hand.

• The upper right dial indicates the 100s digit value.

• 1000 appears when the speed exceeds 1,000.

• MACH appears when the speed exceeds 1,226.

• The speed hand indicates speed values less than 100.

Only even-numbered values are indicated.

Example:

At a speed of 1,740, the upper right dial indicates 1000 and MACH is displayed. The upper right dial indicates 700. The speed hand indicates 40.

• Speed can be indicated from 0 to 1998. OVER is

indicated by the speed hand when the speed exceeds

1998.

LAP (lap times) or SPL (split times) is shown in the lower right

LAP

(lap times) and

) appears in the lower right display,

SPL

(split times) in the lower right

Split Time

Split time

To set up the stopwatch to take split time readings

1. In the Stopwatch Mode, make sure the stopwatch is stopped and reset to all zeros.

• If you need to reset the stopwatch to all zeros, press A.

2. Make sure that

LAP

• If

(lap times) is displayed, press A to toggle it to

To perform a split time measurement

Speed (calculated)

Minutes

Seconds

SPLIT indicator

A split time reading shows the time elapsed since the beginning of the current time measurement.

• If you want the watch to calculate the speed of the race, specify the race distance for the distance setting.

SPL

(split times) is shown in the lower right display.

Select split time ( the following button operations.

D Start ➝ A Split ➝ A Split Release* ➝ D Stop ➝ A Reset

* The split time is released automatically if you do not

press A within about 12 seconds.

• You can press A to take split readings as many times as you like. The SPLIT indicator flashes while a lap reading is displayed.

• The stopwatch continues elapsed time measurement

Hour

1/1000 seconds

internally while a split time reading is displayed. Pressing A to release the split will switch the lower left display to the elapsed time measurement, or you also could press D to stop elapsed time measurement instead.

• Pressing D to stop elapsed time measurement displays the time (and speed if a distance is specified) of the final split (which is the overall elapsed time).

SPL

) measurement and then perform

To measure times with the stopwatch

Elapsed Time

Start Stop Reset

Lap Time

Start

LAP

(

displayed)

Split Time

Start

SPL

(

displayed)

➤ ➤

➤ ➤ ➤

Lap

(Lap01)

➤ ➤ ➤

Split Split release Stop

Lap

(Lap02)

➤

Stop Reset

➤

Reset

▲

Elapsed Time Measurement

Use the following procedure to measure elapsed time, without taking lap time or split time readings.

To perform elapsed time measurement

Select split time ( D Start ➝ D Stop ➝ A Reset

• If you have a distance value specified for the current elapsed time measurement, the

upper right dial and speed hand will indicate the overall speed when you press D to stop the elapsed time operation.

• After pressing D to stop an elapsed time operation, you could press D again to

restart from the point where you left off.

Lap Time

Lap time

To set up the stopwatch to take lap time readings

1. In the Stopwatch Mode, make sure the stopwatch is stopped and reset to all zeros.

• If you need to reset the stopwatch to all zeros, press A.

2. Make sure that

SPL

• If

To perform a lap time measurement

Speed (calculated)

Minutes

Seconds

SPL

) measurement and then perform the following button operations.

A lap time reading shows the time elapsed since the last lap time reading was taken.

• If you want the watch to calculate the speed of each lap (when all of the laps are the same distance), specify the lap distance for the distance setting.

• If you want the watch to calculate the speed of the entire race, specify the race distance for the distance setting. A speed will be indicated each time you take a lap reading, but these lap speeds will not indicate actual speed of the entire race.

LAP

(split times) is displayed, press A to toggle it to

1/1000 seconds

(lap times) is shown in the lower right display.

LAP

Lap number

LAP indicator

Select lap time ( following button operations.

D Start ➝ A Lap* ➝ A Lap* ➝ D Stop ➝ A Reset

* The lap time is released automatically in about 12

seconds.

• You can press A to take lap readings as many times as you like. The LAP indicator flashes while a lap reading is displayed.

• A lap number (#01 through #99) alternates with the lap hour value in the lower right display while a lap time reading is displayed. If you take more than 99 lap readings, the lap number will restart from #00 following lap #99.

• Pressing D to stop elapsed time measurement displays the time (and speed if a distance is specified) of the final lap.

) measurement and then perform the

LAP

Countdown Timer

Auto-repeat off

Start time (Hours Minutes)

To use the countdown timer

Press D while in the Countdown Timer Mode to start the countdown timer.

• When the end of the countdown is reached, the alarm will sound for 10 seconds or

• The countdown time is reset to its starting value automatically after the alarm stops

• When auto-repeat is turned on, the countdown will restart automatically without

• The countdown timer measurement operation continues even if you exit the

• Press D while a countdown operation is in progress to pause it.

• To stop a countdown timer operation completely, first pause it (by pressing D), and

Seconds

until you stop it by pressing any button.

if auto-repeat is turned off.

pausing when it reaches zero.

Countdown Timer Mode.

Press D again to resume the countdown.

then press A. This returns the countdown time to its starting value.

To configure countdown start time and auto-repeat settings

Start time (Hours Minutes)

Auto-repeat on

3. Perform the following operations, depending on which setting currently is selected on the display.

• While the start time setting is flashing, use D (+) and B (–) to change it.

• While the auto-repeat on/off setting is flashing on the display, press D to toggle

auto-repeat on (

4. Press A to exit the setting mode.

• The auto-repeat on (

this function is turned on.

You can set the countdown timer start time within a range of one minute to 24 hours. An alarm sounds when the countdown reaches zero.

• You also can select auto-repeat, which automatically restarts the countdown from the original value you set whenever zero is reached.

• All of the operations in this section are performed in the Countdown Timer Mode, which you enter by pressing C.

1. While the countdown start time is on the display in the

Countdown Timer Mode, hold down A for about three seconds until the hour setting of the countdown start time starts to flash. This is the setting mode.

• If the countdown start time is not displayed, use the procedure under “To use the countdown timer” to display it.

2. Press C to move the flashing in the sequence shown

below, and select the setting you want to change.

Start Time

(Minutes)

) and off ( ).

Start Time

(Hours)

Auto-Repeat

On/Off

) is displayed on the Countdown Timer Mode screen while

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