G-Shock GD-100 - Manual (Page 3)

3
Operation Guide 3263
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 •
sounds for ten seconds or until you stop it by pressing
any button. The countdown time is reset to its starting
value automatically when the alarm sounds.
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 A. This returns the
countdown time to its starting value.
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes.
A display range of the stopwatch is 23 hours, 59 minutes, •
59.99 seconds.
A stopwatch continues to run, restarting from zero after it •
reaches its limit, until you stop it.
A stopwatch measurement operation continues even if •
you exit the Stopwatch Mode.
Exiting the Stopwatch Mode while a split time is frozen •
on the display clears the split time and returns to elapsed
time measurement.
All of the operations in this section are performed in the •
Stopwatch Mode, which you enter by pressing C.
Seconds
Minutes
Hours
1/100 second
To measure times with the stopwatch
Elapsed Time
D
D D D A
Start Stop Re-start Stop Clear
Split Time
D
A A D A
Start Split
( SPL displayed)
Split release Stop Clear
Two Finishes
D
A D A A
Start Split
First runner
finishes. Display
time of first
runner.
Stop
Second runner
finishes.
Split release
Display time of
second runner.
Clear
Illumination
This watch has two LEDs (light-emitting diode) that cause
the entire display to glow for easy reading in the dark. The
watch’s auto light switch turns on illumination automatically
when you angle the watch for reading 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 Precautions” for more important •
information.
Auto light switch on
indicator
To turn on illumination
In any mode (except when a setting screen is on the display), press B to turn on
illumination.
You can use the procedure above to select either 1.5 seconds or 3 seconds as the •
illumination duration. When you press B, the illumination will remain on for about
1.5 seconds or 3 seconds, depending on the current illumination duration setting.
To specify the illumination duration
In the Timekeeping Mode, hold down 1. A until the
seconds start to flash, which indicates the setting
screen.
While the seconds are flashing, press 2. C nine times to
display the illumination duration setting screen.
Press 3. D to toggle between 1.5 seconds ( ) and
3 seconds ( ).
Press 4. A to exit the setting screen.
About the Auto Light Switch
While the auto light switch is enabled, illumination turns on whenever you position
your wrist as described below in any mode.
Moving the watch to a position that is parallel to the ground and then tilting it
towards you at more than 40 degrees causes illumination to turn on.
Wear the watch on the outside of your wrist. •
Parallel to ground More than 40°
Warning!
Always make sure you are in a safe place whenever you are reading 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 on 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.
To turn the auto light switch on and off
In the Timekeeping Mode, hold down B for about three seconds to toggle the auto
light switch on (auto light switch on indicator displayed) or off (auto light switch on
indicator not displayed).
The auto light switch on indicator is on the display in all modes while the auto light •
switch is turned on.
In order to protect against running down the battery, the auto light switch turns off •
automatically approximately six hours after you turn it on.
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.
Graphic Areas
There are two graphic areas named A and B.
Graphic area B
Graphic area A Graphic area A: In the Timekeeping Mode and World •
Time Mode, segments indicate the
current time (in units of 10 seconds).
In the Countdown Timer Mode and
Stopwatch Mode, segments indicate the
ongoing timer measurement (in units of
1/10 second).
Graphic area B: In the Timekeeping Mode and World •
Time Mode, segments indicate the
current time (in units of one second).
In the Countdown Timer Mode and
Stopwatch Mode, segments indicate the
ongoing timer measurement (in units of
one second).
Button Operation Tone
The button operation tone sounds any time you press one
of the watch’s 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, and the countdown alarm all
operate normally.
Mute indicator
To turn the button operation tone on and off
In any mode (except when a setting screen is on the display), hold down C to toggle
the button operation tone on (the mute indicator not displayed) and off (the mute
indicator displayed).
Holding down • C to turn the button operation tone on or off also causes the watch’s
current mode to change.
The mute indicator is displayed in all modes when the button operation tone is •
turned off.
Auto Return Features
If you leave the watch in the Alarm Mode for two or three minutes without performing •
any operation, it automatically changes to the Timekeeping Mode.
If you leave a screen with flashing digits on the display for two or three minutes •
without performing any operation, the watch automatically exits the setting screen.
Scrolling
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 World Time or Alarm Mode, the data you were viewing when you
last exited the mode appears first.
Timekeeping
Resetting the seconds to • 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 without changing the minutes.
The year can be set in the range of 2000 to 2099. •
The watch’s 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 watch’s battery replaced.
World Time
The seconds count of the World Time is synchronized with the seconds count of the •
Timekeeping Mode.
All World Time Mode times are calculated from the current Home City Time in the •
Timekeeping Mode using UTC time offset values.
The UTC offset is a value that indicates the time difference between a reference •
point in Greenwich, England and the time zone where a city is located.
The letters “UTC” is the abbreviation for “Coordinated Universal Time”, which is the •
world-wide scientific standard of timekeeping. It is based upon carefully maintained
atomic (cesium) clocks that keep time accurately to within microseconds. Leap
seconds are added or subtracted as necessary to keep UTC in sync with the Earth’s
rotation.