Casio G7900a4 Manual

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Operation Guide 3194
MA0905-EB
Getting Acquainted
Warning!•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.
Timekeeping ModeWorld Time Mode Alarm Mode Countdown Timer 
Mode Stopwatch 
Mode (ST1) Tide/Moon Data 
ModeStopwatch 
Mode (ST2)
Press     .
Screen        To do this:Reset the seconds to Toggle between Daylight Saving
Time () and Standard Time ()Specify the UTC offsetChange the hour or minutesChange the yearChange the month or dayDo this:
Press D.Press D.
Use D (+) and B (–).Use D (+) and B (–).
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.
TimekeepingUse 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
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.
Setting the Time and DateThis 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 date1. 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.
2. Press C to move the flashing in the sequence shown below to select other
settings.
Seconds UTC offset
Hour
Year Minutes DayDST
Month
Home time zone 
Day of week 
Month – Day  Hour : Minutes 
PM indicator Tide graph 
Moon phase indicator 
Seconds 
3. When the setting you want to change is flashing, use D and B to change it as
described below.
•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 Time1. 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.
To toggle between 12-hour and 24-hour timekeepingIn the Timekeeping Mode, press D to toggle between 12-hour timekeeping and 24-
hour 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.
DST indicator  
						

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Operation Guide 3194
Countdown TimerThe 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 auto-
repeat 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
C.
Configuring the Countdown TimerThe 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.
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.
StopwatchesYour 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.
To measure times with the stopwatch
(Stopwatch Mode (ST1) and Stopwatch Mode (ST2))
Elapsed Time 
StartStop Re-start Stop Clear
StartSplit
( displayed) Split release Stop Clear
StartSplit Stop Split release Clear Split Time 
Two Finishes
First runner finishes.
Display time of first 
runner.Second runner 
finishes.Display time of 
second runner.
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)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.
Longitude value 
ScreenSettingLongitude Value
Longitude
(East/West)
Lunitidal Interval
Hours, Minutes
Button OperationsUse 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.
Seconds  
Minutes  1/100 second 
Timekeeping Mode time 
* During stopwatch elapsed 
time measurement,  
shows the number of 
hours elapsed.
Seconds  Hours 
Minutes 
Home Site DataMoon 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
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.
4. Press C to move the flashing in the sequence shown below to select other settings.
Longitude Value
Lunitidal Interval MinutesLunitidal Interval Hours
Longitude (East/West)
5. When the setting you want to change is flashing, use D and B to change it as
described below.
6. Press A to exit the setting screen.
Tide/Moon DataTide/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 .
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
Press     .
Tide graph  
Moon age  
Time Moon phase indicator 
Month – Da
y Month – Day •While the tide data screen is displayed, use D (+) and B (–) to change the
displayed time in one-hour increments.
•While the Moon data screen is displayed, use D (+) and B (–) to change the
displayed date in one-day increments. Pressing D and B will display the year of
the displayed date for about one second.
•You also can specify a particular date (year, month, day) to view its tide data and
Moon data. See “To specify a date” for more information.
•When you enter the Tide/Moon Data Mode, the screen (tide data or Moon data) that
was displayed the last time you exited the mode appears first.
To specify a date1. 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.
YearMonthDay
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.
4. Press A to exit the setting screen.
5. Use A to display either the tide data screen or the Moon data screen.
Tide graph  
Time Moon phase indicator 
Month – Da
y 
Month – Day  Year  
						

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Operation Guide 3194
IlluminationThis watch has an EL (electro-luminescent) panel that
causes 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 indicator) for it to operate.
•See “Illumination Precautions” for more important
information.
World TimeWorld Time shows the current time in 48 cities (29 time
zones) around the world.
•All of the operations in this section are performed in the
World Time Mode, which you enter by pressing C.
To view the time for another city codeIn the World Time Mode, press D to scroll eastwardly
through city codes.
In the World Time Mode, press B to scroll westwardly
through city codes.
•For full information about city codes, see the “City Code
Table”.
•If the current time for a city is wrong, check your
Timekeeping Mode time and time zone settings and
make necessary changes.
To toggle a city code time between Standard Time and Daylight Saving Time1. In the World Time Mode, use D (east) and B (west) to
display the city code (time zone) whose Standard Time/
Daylight Saving Time setting you want to change.
2. Hold down A for about one second to toggle Daylight
Saving Time (DST displayed) and Standard Time (DST
not displayed).
•The DST indicator is on the display whenever you
display a city code for which Daylight Saving Time is
turned on.
•Note that the DST/Standard Time setting affects only the
currently displayed city code. Other city codes are not
affected.
Alarm OperationThe alarm tone sounds at the preset time for 20 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.
•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
Displaying the  setting screen
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
To turn an alarm on and off1. In the Alarm Mode, use D to select an alarm.
2. Press A to toggle it on and off.
•Turning on an alarm (
, , , )
displays the alarm on indicator, while turning on the
snooze alarm (
) displays the snooze alarm
indicator.
•In all modes, the alarm on indicator is shown for alarm
that is currently turned on.
•The alarm on indicator flashes while the alarm is
sounding.
•The snooze alarm indicator flashes while the snooze alarm
is sounding and during the 5-minute intervals between
alarms.
To turn the Hourly Time Signal on and off1. In the Alarm Mode, use D to select the Hourly Time
Signal ().
2. Press A 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.
AlarmsYou 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.
You can also turn on an Hourly Time Signal that causes
the watch to beep twice every hour on the hour.
•There are five alarm screens numbered 
, ,, and  for the one-time alarm, a snooze alarm
screen indicated by . The Hourly Time Signal
screen is indicated by .
•All of the operations in this section are performed in the
Alarm Mode, which you enter by pressing C.
Alarm TypesThe alarm type is determined by the settings you make, as described below.
• •• •
• 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.
• •• •
• 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.
• •• •
• 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 time1. In the Alarm Mode, use D or B to scroll through the
alarm screens until the one whose time you want to set
is displayed. •To specify a countdown start time of 24 hours, set 
.
4. Press A to exit the setting screen.
•You can also perform steps 1 and 2 of the above procedure whenever you need to
view the current auto-repeat and progress beeper settings.
To use the countdown timerPress D while in the Countdown Timer Mode to start the
countdown timer.
•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 configure the countdown timer1. 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 timer”
to display it.
2. Press C to move the flashing in the sequence shown
below to select other settings.
Hours
Progress Beeper
Minutes
Auto-repeat
3. When the setting you want to change is flashing, use B and D to change it as
described below.
SettingHours, MinutesAuto-repeat
Progress Beeper
ScreenButton OperationUse D (+) and B (–) to change the setting.Press D to toggle auto-repeat on ( displayed) and off
( displayed).Press D to toggle the progress beeper on () and off ().
ScreenTo do this:Change the hour
and minutes
Change the
month and dayDo this:
Use D (+) and B (–).
•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.
Hourly time signal 
on indicator 
Snooze alarm 
indicator 
Alarm on indicator 
Current time and date in 
the zone of the selected 
cit
y code City code Alarm time 
(Hour : Minutes) Alarm number  Alarm on indicator 
Alarm date 
(Month – Day) 
Auto light switch indicator 
•To set a one-time alarm, display an alarm screen , , , or .
To set the snooze alarm, display the  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.
Hour Minutes Month Day
4. While a setting is flashing, use D and B to change it as described below.
5. Press A to exit the setting screen.
To illuminate the displayIn any mode, press L to turn on illumination.
•The above operation turns on illumination regardless of the current auto light switch
setting.
•You can use the procedure below to select either 3 seconds or 5 seconds as the
illumination duration. When you press L, the illumination will remain on for about
3 seconds or 5 seconds, depending on the current illumination duration setting.
To specify the illumination duration1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. While the seconds are flashing, press B to toggle the
setting between 3 seconds (
) and 5 seconds ().
3. Press A twice to exit the setting screen.
DST indicator  
						

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Operation Guide 3194
Graphic AreasThere are two graphic areas named A and B.
Graphic area B  Graphic area A 
•In all modes, graphic area A shows the Stopwatch Mode (ST1) minutes (one
segment each for 5 minutes, 10 minutes, etc.).
•In all modes, graphic area B shows the Stopwatch Mode (ST2) minutes (one
segment each for 5 minutes, 10 minutes, etc.).
Flash AlertWhen Flash Alert is turned on, the illumination flashes for
the alarms, the Hourly Time Signal, the countdown alarm,
and stopwatch (ST1) auto start.
To turn Flash Alert on and offIn the Timekeeping Mode, hold down D for about three
seconds to toggle Flash Alert on (Flash Alert indicator
displayed) or off (Flash Alert indicator not displayed).
•Illumination flashes twice when you turn Flash Alert on
and once when turn Flash Alert off.
•While Flash Alert is turned on, the Flash Alert indicator
remains on the display in all modes.
•Note that pressing D to toggle Flash Alert on or off will
also switch timekeeping between 12-hour and 24-hour
format.
Button Operation ToneThe 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, the countdown alarm,
and stopwatch auto start all operate normally.
To turn the button operation tone on and offIn any mode (except when a setting screen is on the
display), hold down C to toggle the button operation tone
on (mute indicator not displayed) and off (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 Tide/Moon Data or 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.
ScrollingThe 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 ScreensWhen 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 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 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 TimeAll World Time Mode times are calculated from the current Home Site time in the
Timekeeping Mode using UTC offset values.
•The seconds count of the World Time is synchronized with the seconds count of the
Timekeeping Mode.
•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.
Illumination Precautions•The electro-luminescent panel that provides illumination loses power after very long
use.
•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.
•Illumination turns off automatically whenever an alarm sounds.
•Frequent use of illumination runs down the battery.
Mute indicator  
Flash Alert indicator 
About the Auto Light SwitchWhile 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.
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 offIn the Timekeeping Mode, hold down B for about three seconds to toggle the auto
light switch on (auto light switch indicator displayed) or off (auto light switch indicator
not displayed).
•The auto light switch 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.
ReferenceThis 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.
Moon Phase IndicatorThe Moon phase indicator of this watch indicates the current phase of the Moon as
shown below.
Moon Phase
Indicator
Moon Age0.0 - 1.8
27.7 -  29.5
New
MoonFirst
Quarter
(Waxing)Full
MoonLast
Quarter(Waning)
1.9 - 5.5 5.6 - 9.2 9.3 - 12.9 13.0 - 16.6 16.7 - 20.2 20.3 - 23.9 24.0 - 27.6
Moon PhaseMoon phase (part you can see) (part you cannot see)
•The Moon phase indicator shows the Moon as viewed at noon from a position in the
Northern Hemisphere looking south. Note that at times the image shown by the
Moon phase indicator may differ from that of the actual Moon in your area.
•The left-right orientation of the Moon phase is reversed when viewing from the
Southern Hemisphere or from a point near the equator.
Moon Phases and Moon Age
The Moon goes through a regular 29.53-day cycle. During each cycle, the Moon
appears to wax and wane as the relative positioning of the Earth, Moon, and Sun
changes. The greater the angular distance between the Moon and the Sun,* the more
we see illuminated.
*The angle to the Moon in relation to the direction at which the Sun is visible from the
Earth.
This watch performs a rough calculation of the current Moon age starting from day 0
of the moon age cycle. Since this watch performs calculations using integer values
only (no fractions), the margin for error of the displayed Moon age is 
±1 day.
Tide GraphThe Tide Graph has six graphic segments, each of which indicates a different tide
level. The current tide level is indicated by the displayed graphic segment.
HL
High Tide
(Rising Tide)(Rising Tide)(Falling Tide)Low Tide
Tidal Movements
Tides are the periodic rise and fall of the water of oceans, seas, bays, and other
bodies of water caused mainly by the gravitational interactions between the Earth,
Moon and Sun. Tides rise and fall about every six hours. The tide graph of this watch
indicates tidal movement based on the Moon’s transit over a meridian and the lunitidal
interval. The lunitidal interval differs according to your current location, so you must
specify a lunitidal interval in order to obtain the correct tide graph readings.
•The tide graph displayed by this watch is based on the current Moon age.
Remember that the margin for error of the Moon age displayed by this watch is ±1
day. The greater the error in a particular Moon age, the greater the error in the
resulting tide graph.
Lunitidal Interval
Theoretically, high tide is at the Moon’s transit over the meridian and low tide is about
six hours later. Actual high tide occurs somewhat later, due to factors such as
viscosity, friction, and underwater topography. Both the time differential between the
Moon’s transit over the meridian until high tide and the time differential between the
Moon’s transit over the meridian until low tide are known as the “lunitidal interval”.
When setting the lunitidal interval for this watch, use the time differential between the
Moon’s transit over the meridian until high tide. 
						

							5
Operation Guide 3194
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.
•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 the preset illumination
duration (see “To specify the illumination duration”),
even if you keep the watch pointed towards your face.
•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 towards 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 offset
Lunitidal
Site Standard DST/ Longitude
Interval
Time Summer TimeAnchorage–9–8 149°W 5:40Bahamas–5–477°W 7:30Baja, California–7–6110°W 8:40Bangkok +7 +8 101°E 4:40Boston–5–471°W 11:20Buenos Aires–3–258°W 6:00Casablanca 0 +1 8°W 1:30Christmas Island +14 +15 158°W 4:00Dakar 0 +1 17°W 7:40Gold Coast +10 +11 154°E 8:30Great Barrier Reef, Cairns +10 +11 146°E 9:40Guam +10 +11 145°E 7:40Hamburg +1 +2 10°E 4:50Hong Kong +8 +9 114°E 9:10Honolulu–10–9 158°W 3:40Jakarta +7 +8 107°E 0:00Jeddah +3 +4 39°E 6:30Karachi +5 +6 67°E 10:10Kona, Hawaii–10–9 156°W 4:00Lima–5–477°W 5:20Lisbon 0 +1 9°W 2:00London 0 +1 0°E 1:10Los Angeles–8–7118°W 9:20Maldives +5 +6 74°E 0:10Manila +8 +9 121°E 10:30Mauritius +4 +5 57°E 0:50Melbourne +10 +11 145°E 2:10Miami–5–480°W 7:30Noumea +11 +12 166°E 8:30Pago Pago–11–10 171°W 6:40Palau +9 +10 135°E 7:30Panama City–5–480°W 3:00Papeete–10–9 150°W 0:10Rio De Janeiro–3–243°W 3:10Seattle–8–7 122°W 4:20Shanghai +8 +9 121°E 1:20Singapore +8 +9 104°E 10:20Sydney +10 +11 151°E 8:40Tokyo +9 +10 140°E 5:20Vancouver–8–7 123°W 5:10
Wellington +12 +13 175°E 4:50
*Based on data as of 2003.
Specifications
Accuracy at normal temperature: ±15 seconds a month
Timekeeping: Hour, minutes, seconds, p.m. (P), month, day, day of the week
Time format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to 2099
Other: Home Time zone (selectable in 0.5-hour increments in the range of –12.0 to
+14.0); Daylight Saving Time (summer time)/Standard Time
Tide/Moon Data:Moon phase indicator for specific date; Tide level for specific date
and time
Stopwatch (ST1)
Measuring unit: 1/100 second
Measuring capacity: 999:59 59.99
Measuring modes: Elapsed time, split time, two finishes
Other: Auto-Start
Stopwatch (ST2)
Measuring unit: 1/100 second
Measuring capacity: 999:59 59.99
Measuring modes: Elapsed time, split time, two finishes
Countdown Timer
Measuring unit: 1 second
Input range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Other: Auto-repeat timing; Progress beeper
Alarms:5 multi-function* alarms (four one-time alarms; one snooze alarm);
Hourly Time Signal
    *
Alarm type: Daily alarm, date alarm, 1-month alarm, monthly alarmWorld Time: 48 cities (29 time zones)
Other: Daylight Saving Time/Standard Time
Illumination:EL (electro-luminescent panel); Selectable illumination duration;
Auto Light Switch
Other: Button operation tone on/off, Flash alert
Battery: One lithium battery (Type: CR2025)
Approximately 2 years on type CR2025; 20 seconds of alarm operation (with flash
alert) per day, one countdown timer operation (with progress beeper and flash alert)
per week, one stopwatch operation (with auto start and flash alert) per week,
5 seconds of illumination per day
City Code Table
Site/Lunitidal Interval Data List
•Based on data as of December 2008.
•The rules governing global times (UTC offset and GMT differential) and summer
time are determined by each individual country.
* In December 2007, Venezuela changed its offset from –4 to –4.5. Note, however, that this
watch displays an offset of –4 (the old offset) for the CCS (Caracas, Venezuela) city code.
NicosiaHelsinkiCairoJerusalemMoscowJeddahTehranDubaiKabulKarachiDelhiDhakaYangonBangkokSingaporeHong KongBeijingPerthSeoulTokyoAdelaideSydneyNoumea
Wellington+2
+3+3.5+4+4.5+5+5.5+6+6.5+7
+8
+9+9.5+10+11
+12
NICHELCAIJRSMOWJEDTHRDXBKBLKHIDELDACRGNBKKSINHKGBJSPERSELTYOADLSYDNOU
WLGCity
CodeUTC offset/GMT DifferentialCityPago PagoHonoluluAnchorageLos AngelesDenverMexico CityChicagoNew YorkCaracasSt. JohnsRio De JaneiroBuenos AiresPraiaLondonDakarMadridParisMonte CarloRomeBerlinStockholmAthensJohannesburgAnkara
–11–10–9–8–7
–6
–5–4–3.5
–3
–1
0
+1
+2
PPGHNLANCLAXDENMEXCHINYCCCS*YYTRIOBUERAILONDKRMADPA RMCMROMBERSTOAT HJNBANKCity
CodeUTC offset/GMT DifferentialCity