Casio G7900A-7 Operation Manual
MA0905-EB
Operation Guide 3194
Getting Acquainted
• The measurement functions built into this watch are not intended for use in
taking measurements that require professional or industrial precision. Values
produced by this watch should be considered as reasonably accurate
representations only.
• The longitude, lunitidal interval, Moon phase indicator and tide graph data that
appear on the display of this watch are not intended for navigation purposes.
Always use proper instruments and resources to obtain data for navigation
purposes.
• This watch is not an instrument for calculating low tide and high tide times. The
tide graph of this watch is intended to provide a reasonable approximation of
tidal movements only.
• CASIO COMPUTER CO., LTD. assumes no responsibility for any loss, or any
claims by third parties that may arise through the use of this watch.
Warning!
About This Manual
• 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.
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 World Time ModeAlarm ModeCountdown Timer
Press .
Tide/Moon Data
Mode
Timekeeping
Moon phase indicator
Hour : Minutes
PM indicator
Setting the Time and Date
This watch is preset with UTC offset values that represent each time zone around the
globe. Before setting the time, be sure to set the UTC offset for your Home Site first,
which is the location where you normally will be using the watch.
• Note that World Time Mode times are all displayed based on the time and date
settings you configure in the Timekeeping Mode.
To set the time and date
2. Press C to move the flashing in the sequence shown below to select other
settings.
Tide graph
Day of week
Month – Day
Home time zone
Seconds UTC offset
Use the Timekeeping Mode to set and view the current
time and date.
• The tide graph shows tidal movements for the current
date in accordance with the current time as kept in the
Timekeeping Mode.
• The Moon phase indicator shows the current Moon
phase in accordance with the current date as kept in the
Timekeeping Mode.
Important!
• Be sure to configure the current time and date, and your
Seconds
Home Site data (data for the site where you use the
watch) correctly before using the functions of this watch.
See “Home Site Data” for more information.
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
• Be sure to configure the correct UTC offset for your
Home Site before configuring any other Timekeeping
Mode settings.
• See the “City Code Table” for information about the
UTC offset settings that are supported.
DST
Month
Year MinutesDay
Stopwatch
Mode (ST1)
Hour
Stopwatch
Mode (ST2)
3. When the setting you want to change is flashing, use D and B to change it as
described below.
Screen
To do this:
Reset the seconds to
Toggle between Daylight Saving
Time ( ) and Standard Time ( )
Specify the UTC offset
Change the hour or minutes
Change the year
Change the month or day
• See “Daylight Saving Time (DST)” for details about DST setting
• The UTC offset setting range is –12.0 to +14.0, in 0.5-hour units.
• When DST is turned on, the UTC offset setting range is –11.0 to +15.0, in
0.5-hour units.
4. Press A twice to exit the setting screen.
• The day of the week is displayed automatically in accordance with the date (year,
month, and day) settings.
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 toggle the Timekeeping Mode time between DST and Standard Time
DST indicator
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press D to toggle between 12-hour timekeeping and 24hour timekeeping.
• 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.
• The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all other modes.
• The P indicator is not displayed when the current time is displayed in other modes.
Mode
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C to display the DST setting screen.
3. Press D to toggle between Daylight Saving Time
(
displayed) and Standard Time ( displayed).
4. Press A twice to exit the setting screen.
• The DST indicator appears on the Timekeeping, and
Tide/Moon Data screens to indicate that Daylight Saving
Time is turned on. In the case of the Tide/Moon Data
Mode, the DST indicator appears on the Tide Data
screen only.
Do this:
Press D.
Press D.
Use D (+) and B (–).
Use D (+) and B (–).
.
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Operation Guide 3194
y
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Home Site Data
Moon phase, tide graph data, and Tide/Moon Data Mode data will not be displayed
properly unless Home Site data (UTC offset, longitude, and lunitidal interval) is
configured correctly.
• 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.
• The lunitidal interval is the time elapsing between the Moon’s transit over a meridian
and the next high tide at that meridian. See “Lunitidal Interval” for more information.
• This watch displays lunitidal intervals in terms of hours and minutes.
• The “Site/Lunitidal Interval Data List” provides UTC offset and longitude information
around the world.
• The following is the initial factory default Home Site data (Tokyo, Japan) when you
first purchase the watch, and whenever you have the battery replaced. Change
these settings to match the area where you normally use the watch.
UTC offset (+9.0); Longitude (East 140 degrees); Lunitidal interval (5 hours,
20 minutes)
To configure Home Site data
Longitude value
4. Press C to move the flashing in the sequence shown below to select other settings.
Longitude Value
Lunitidal Interval Minutes
5. When the setting you want to change is flashing, use D and B to change it as
described below.
Longitude Value
Longitude
(East/West)
Lunitidal Interval
Hours, Minutes
6. Press A to exit the setting screen.
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C twice to display the UTC offset setting screen,
and confirm that the setting is correct.
• If the UTC offset setting is not correct, use D (+) and
B (–) to change it.
3. Press A to display the longitude value setting screen.
Longitude (East/West)
Lunitidal Interval Hours
ScreenSetting
Use D (+) and B (–) to change the setting.
• You can specify a value in the range of 0° to 180°, in
1-degree units.
Use D to switch between east longitude ( ) and west
longitude ( ).
Use D (+) and B (–) to change the setting.
Button Operations
Stopwatches
1/100 second
Seconds
Minutes
Timekeeping Mode time
* During stopwatch elapsed
time measurement,
shows the number of
hours elapsed.
To measure times with the stopwatch
(Stopwatch Mode (ST1) and Stopwatch Mode (ST2))
Elapsed Time
Start
Split Time
Start
Two Finishes
Start
About Auto-Start (Stopwatch Mode (ST1))
With Auto-Start, the watch performs a 5-second countdown, and stopwatch operation
starts automatically when the countdown reaches zero.
During the final three seconds of the countdown, a beeper sounds with each second.
To use Auto-Start (ST1)
Your watch has two stopwatch modes:Stopwatch Mode
(ST1) and Stopwatch Mode (ST2). Both stopwatch modes
let you measure elapsed time, split times, and two
finishes. The Stopwatch Mode (ST1) includes Auto-Start.
• A display range of the stopwatch is 999 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 a Stopwatch Mode.
• Exiting a 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 (ST1) or Stopwatch Mode (ST2),
which you enter by pressing C.
Stop Re-start Stop Clear
Split
( displayed)
Split Stop Split release Clear
First runner finishes.
Display time of first
runner.
Split release Stop Clear
Second runner
finishes.
1. While the stopwatch screen is showing all zeros in the
Stopwatch Mode, press B.
• This displays a 5-second countdown screen.
• To return to the all zeros screen, press B again.
2. Press D to start the countdown.
• When the countdown reaches zero, a tone sounds and
a stopwatch timing operation starts automatically.
• Pressing D while the Auto-Start countdown is in
progress starts the stopwatch immediately.
Display time of
second runner.
Tide/Moon Data
Moon phase indicator
Tide graph
Time
Month – Da
Tide/Moon Data Screens
In the Tide/Moon Data Mode, press A to toggle between the tide data screen and the
Moon data screen.
Tide Data Screen Moon Data Screen
Tide graph
• While the tide data screen is displayed, use D (+) and B (–) to change the
• While the Moon data screen is displayed, use D (+) and B (–) to change the
• You also can specify a particular date (year, month, day) to view its tide data and
• When you enter the Tide/Moon Data Mode, the screen (tide data or Moon data) that
Time
displayed time in one-hour increments.
displayed date in one-day increments. Pressing D and B will display the year of
the displayed date for about one second.
Moon data. See “To specify a date” for more information.
was displayed the last time you exited the mode appears first.
To specify a date
Year
Month – Day
4. Press A to exit the setting screen.
5. Use A to display either the tide data screen or the Moon data screen.
Tide/Moon data lets you view the Moon age and Moon
phase for a particular date, and tidal movements for a
particular date and time at your Home Site.
• When you enter the Tide/Moon Data Mode, the data for
6:00 a.m. on the current date appears first.
• If you suspect that the Tide/Moon data is not correct for
some reason, check the Timekeeping Mode data
(current time, date, and Home Site settings), and make
changes as required.
• See “Moon Phase Indicator” for information about the
Moon phase indicator and “Tide Graph” for information
about the tide graph.
• All of the operations in this section are performed in the
Tide/Moon Data Mode, which you enter by pressing C .
Moon phase indicator
Press .
Month – Da
1. In the Tide/Moon Data Mode, hold down A until the
year setting starts to flash, which indicates the setting
screen.
2. Press C to move the flashing in the sequence shown
below to select the other settings.
Year
3. While a setting is flashing, use D (+) or B (–) to change
it.
• You can specify a date in the range of January 1,
2000 to December 31, 2099.
Month – Day
Month Day
Moon age
Countdown Timer
The countdown timer can be set within a range of one
minute to 24 hours. An alarm sounds when the countdown
reaches zero. The countdown timer also has an autorepeat feature and a progress beeper that signals the
progress of the countdown.
• All of the operations in this section are performed in the
Countdown Timer Mode, which you enter by pressing
Hours
Minutes
Seconds
Auto-repeat
When auto-repeat is turned on, the countdown restarts automatically from the
countdown start time when it reaches zero.
When auto-repeat is turned off, the countdown stops when it reaches zero and the
display shows the original countdown start time.
• Pressing D while an auto-repeat countdown is in progress pauses the current
countdown. You can resume the auto-repeat countdown by pressing D, or you can
press A to reset to the countdown time starting value.
Countdown Timer Beeper Operations
The watch beeps at various times during a countdown so you can keep informed
about the countdown status without looking at the display. The following describes the
types of beeper operations the watch performs during a countdown.
Countdown End Beeper
The countdown end beeper lets you know when the countdown reaches zero.
• When the progress beeper is turned off, the countdown end beeper sounds for
about 10 seconds, or until you press any button to stop it.
• When the progress beeper is turned on, the countdown end beeper sounds for
about one second.
Progress Beeper
When the progress beeper is turned on, the watch uses beeps to signal countdown
progress as described below.
• Starting from five minutes before the end of the countdown, the watch emits four
short beeps at the top of each countdown minute.
• 30 seconds before the end of the countdown, the watch emits four short beeps.
• The watch emits a short beep for each of the last 10 seconds of the countdown.
• If the countdown start time is six minutes or greater, the watch emits a short beep for
each second of the final 10 seconds before the five-minute point is reached. Four
short beeps are emitted to signal when the five-minute point is reached.
C.
Configuring the Countdown Timer
The following are the settings you should configure before
actually using the countdown timer.
Countdown start time; Auto-repeat on/off; Progress
beeper on/off
• See “To configure the countdown timer” for information
about setting up the timer.
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