Casio 5627 User manual

Operation Guide 5627
E-9
Digital Time and Date
Use the Timekeeping Mode to set and view a digital display of the current time and
date. When setting the digital time, you can also configure settings for summer time
(Daylight Saving Time or DST).
To set the digital time and date
1. In the Timekeeping Mode, hold down Auntil the
seconds start to flash, which indicates the setting
screen.
2. Press Cto move the flashing in the sequence shown
below to select the other settings.
Seconds DST Minutes
CC
C
Hour
C
Day Year
C
C
Month
C
E-8
Timekeeping
This watch features separate digital and analog
timekeeping. The procedures for setting the digital time
(page E-9) and analog time (page E-16) are different.
xThe Moon phase indicator (page E-42) shows the
current Moon phase in accordance with the current
date as kept in the Timekeeping Mode.
xThe fishing level indicator indicates the times when
fish can be expected to be feeding. For more
information, see “Fishing/Moon Mode” (page E-19).
Important!
xBe 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” (page E-13) for
more information.
Hour : Minutes Seconds
PM indicator
Fishing level indicator
Day of week Month – Day
Moon phase indicator
E-7
CC
CC
Dual Time ModeHand Setting Mode
Countdown Timer Mode Alarm Mode
E-6
General Guide
xPress Cto change from mode to mode.
xIn any mode (except when a setting screen is on the display), press Bto
illuminate the face of the watch.
Timekeeping Mode Stopwatch ModeFishing/Moon Mode
CCC
E-5
To test the alarm ...................................................................................................E-35
To turn Alarms 2 and 3, and the Hourly Time Signal on and off.......................E-36
To select the operation of Alarm 1 ......................................................................E-37
To set the Dual Time .............................................................................................E-38
To illuminate the face of the watch.....................................................................E-40
To specify the illumination duration....................................................................E-41
To turn the button operation tone on and off ....................................................E-44
E-4
Procedure Lookup
The following is a handy reference list of all the operational procedures contained in
this manual.
To set the digital time and date .............................................................................E-9
To toggle the Timekeeping Mode digital time
between DST and Standard Time ....................................................................E-12
To configure Home Site data ...............................................................................E-14
To toggle between 12-hour and 24-hour timekeeping ...................................... E-16
To adjust the analog time.....................................................................................E-17
To view the current fishing level and Moon data...............................................E-21
To specify a date ...................................................................................................E-23
To measure times with the stopwatch................................................................E-26
To use the countdown timer ................................................................................ E-28
To set up the countdown timer............................................................................ E-29
To set an alarm time .............................................................................................E-33
E-3
Contents
General Guide .......................................................................................................... E-6
Timekeeping ............................................................................................................E-8
Fishing/Moon Mode ..............................................................................................E-19
Stopwatch .............................................................................................................. E-25
Countdown Timer..................................................................................................E-27
Alarms.....................................................................................................................E-31
Dual Time ...............................................................................................................E-38
Illumination............................................................................................................. E-40
Reference............................................................................................................... E-42
Specifications ........................................................................................................E-47
Operating Precautions.......................................................................................... E-50
User Maintenance .................................................................................................E-61
E-2
About This Manual
xButton operations are indicated using the letters
shown in the illustration.
xFor the sake of simplicity, the sample displays in this
manual do not show the analog hands of the watch.
xEach 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.
xTo ensure that this watch provides you with the years
of service for which it is designed, be sure to carefully
read and follow the instructions under “Operating
Precautions” and “User Maintenance”.
E-1
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 and keep it on hand for later
reference when necessary.
Important!
The fishing level indicator and moon phase indicator produced by this watch are
all based on calculations that use the watch’s current time, date, and Home Site
settings. Because of this, you should make sure that the current date and time, and
your Home Site data are all correct before using the indicators.
xWhen fishing, always take proper precautions to ensure your own personal
safety and the personal safety of others around you.
xNote that the fishing level indicator and moon phase indicator are all based on
calculated values. They are provided only for reference purposes.
xSee the “Timekeeping” section of this manual for information about setting the
current time and date, and about specifying your Home Site.
MA1909-EA © 2019 CASIO COMPUTER CO., LTD.

Operation Guide 5627
E-19
Fishing/Moon Mode
The Fishing/Moon Mode displays an indicator that shows,
as one of five levels, the suitability of a specific date and
time (minute 00 to minute 59 of a particular hour) for
fishing. This mode also can be used to display Moon Data
(Moon age and Moon phase) for a specific date.
xIf you doubt that the fishing level indicator or current
Moon data is wrong for some reason, check the
current Timekeeping Mode settings (time, date, and
Home Site), and correct them if required.
xSee “Moon Phase Indicator” (page E-42) for
information about the Moon phase indicator.
xAll of the operations in this section are performed in
the Fishing/Moon Mode, which you enter by pressing
C(page E-6).
Time
Fishing level indicator
Year Month – Day
Moon phase indicator
E-18
4. Press Ato exit the setting screen.
xThe watch will automatically adjust the minute hand slightly to match its internal
second count when you exit the setting screen.
xTo return to the Timekeeping Mode, press C.
E-17
To adjust the analog time
1. In the Timekeeping Mode, press Csix times to enter
the Hand Setting Mode (page E-7).
2. Hold down Auntil the current digital time starts to
flash, which indicates the analog setting screen.
3. Press Dto advance the analog time setting by
20seconds.
xHolding down Dadvances the analog time setting
at high speed.
xIf you need to advance the analog time setting a long way, hold down D
until the time starts advancing at high speed, and then press B. This locks
the highspeed hand movement, so you can release the two buttons. High-
speed hand movement continues until you press any button. It will also stop
automatically after the time advances 12 hours or if an alarm (multi-function
alarm, Hourly Time Signal, or countdown beeper) starts to sound.
E-16
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press Dto toggle between 12-hour timekeeping and
24-hour timekeeping.
xWith 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.
xWith the 24-hour format, times are displayed in the range of 0:00 to 23:59,
without any indicator.
xThe 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all other modes.
xThe Pindicator is not displayed with the Timekeeping Mode time on the
Countdown Timer Mode and Dual Time Mode screens.
Setting the Analog Time
Perform the procedure below when the time indicated by the analog hands does not
match the time of the digital display.
E-15
4. When the setting you want to change is flashing, use Dand Bto change it as
described below.
Setting Screen Button Operations
UTC Differential
Use D(+) and B(–) to change the setting.
xYou can specify a value in the range of –12.0 to
+14.0, in 0.5-hour units.
Longitude Value
Use D(+) and B(–) to change the setting.
xYou can specify a value in the range of 0° to 180°,
in 1-degree units.
East Longitude/
West Longitude
Use Dto switch between east longitude (E) and
west longitude (W).
xWhen the digital time DST setting is on, the UTC differential can be set in a
range of –11.0 to +15.0 in 0.5-hour units.
5. Press Ato exit the setting screen.
E-14
To configure Home Site data
1. In the Timekeeping Mode, hold down Auntil the
seconds start to flash, which indicates the setting
screen.
2. Press Aagain to display the UTC differential setting
screen.
3. Press Cto move the flashing in the sequence shown
below to select other settings.
UTC
Differential
Longitude
Value
East Longitude/
West Longitude
C
C
C
UTC differential
E-13
Home Site Data
Moon phase, the fishing level indicator, and Fishing/Moon Mode data will not
be displayed properly unless Home Site data (UTC differential and longitude) is
configured correctly.
xThe UTC differential is a value that indicates the time difference between
a reference point in Greenwich, England and the time zone where a city is
located.
xThe 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.
xThe “Site Data List” at the back of this manual provides UTC differential,
latitude, and longitude information around the world.
xThe 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 differential (+9.0); Longitude (East 140 degrees)
E-12
To toggle the Timekeeping Mode digital time between DST and Standard Time
1. In the Timekeeping Mode, hold down Auntil the
seconds start to flash, which indicates the setting
screen.
2. Press Conce to display the DST setting screen.
3. Press Dto toggle between Daylight Saving Time (On
displayed) and Standard Time (OF displayed).
4. Press Atwice to exit the setting screen.
xThe DST indicator appears on the Timekeeping,
Fishing/Moon, Alarm, and Hand Setting Mode screens
to indicate that Daylight Saving Time is turned on. In
the case of the Fishing/Moon Mode, the DST indicator
appears on the fishing level screen only.
On/Off status
DST indicator
E-11
xResetting the seconds only (without changing the DST, hour, or minute setting)
causes the analog minute hand setting to be adjusted automatically.
xSee “Digital Time Daylight Saving Time (DST) Setting” below for details about
the DST setting.
xThe day of the week is displayed automatically in accordance with the date
(year, month, and day) settings.
Digital Time Daylight Saving Time (DST) Setting
Daylight Saving Time (summer time) advances the digital time setting by one hour
from Standard Time. Remember that not all countries or even local areas use
Daylight Saving Time.
E-10
3. When the setting you want to change is flashing, use Band Dto change it as
described below.
Screen To do this: Do this:
Reset the seconds to 00 Press D.
Toggle between Daylight Saving Time
(On) and Standard Time (OF)Press D.
Change the hour or minutes
Use D(+) and B(–).
Change the year
Change the month or day
4. Press Atwice to exit the setting screen.
xThe first press of Adisplays the UTC differential setting screen. Pressing A
again exits the setting screen.

Operation Guide 5627
E-29
To set up the countdown timer
1. While the countdown start time is on the display in the
Countdown Timer Mode, hold down Auntil the hour
setting of the countdown start time starts to flash, which
indicates the setting screen.
xIf the countdown start time is not displayed, use
the procedure under “To use the countdown timer”
to display it.
2. Press Cto move the flashing in the sequence shown
below to select other settings.
Hours Minutes Auto-repeat
C
C
C
E-28
To use the countdown timer
Press Dwhile in the Countdown Timer Mode to start the countdown timer.
xWhen the end of the countdown is reached and auto-repeat is turned off, the
alarm sounds for 10 seconds or until you stop it by pressing any button. The
countdown time is automatically reset to its starting value after the alarm stops.
xWhen auto-repeat is turned on, the countdown will restart automatically without
pausing when it reaches zero. The alarm sounds to signal when the countdown
reaches zero.
xThe countdown timer measurement operation continues even if you exit the
Countdown Timer Mode.
xPress Dwhile a countdown operation is in progress to pause it. Press D
again to resume the countdown.
xTo completely stop a countdown operation, first pause it (by pressing D), and
then press A. This returns the countdown time to its starting value.
xFishing level indicator images appear and disappear in time with the countdown
timer measurement operation.
E-27
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.
xYou can also select auto-repeat, which automatically
restarts the countdown from the original value you set
whenever zero is reached.
xAll of the operations is this section are performed in
the Countdown Timer Mode, which you can enter
using C(page E-7).
Minutes
Hours
Timekeeping Mode time
Seconds
E-26
To measure times with the stopwatch
Elapsed Time
DD D D A
Start Stop Resume Stop Reset
Split Time
DA A D A
Start Split
(SPL displayed)
Split release Stop Reset
Two Finishes
DA D A A
Start Split
First runner
finishes.
Display time of first
runner.
Stop
Second runner
finishes.
Split release
Display time of
second runner.
Reset
E-25
Stopwatch
The stopwatch lets you measure elapsed time, split times,
and two finishes.
xThe display range of the stopwatch is 23 hours,
59minutes, 59.99 seconds.
xThe stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
xThe stopwatch measurement operation continues even
if you exit the Stopwatch Mode.
xExiting the Stopwatch Mode while a split time is frozen
on the display clears the split time and returns to
elapsed time measurement.
xFishing level indicator images appear and disappear in
time with the stopwatch time measurement operation.
xAll of the operations in this section are performed in
the Stopwatch Mode, which you enter by pressing C
(page E-6).
Minutes
Hours
1/100 second
Seconds
E-24
3. While a setting is flashing, use D(+) or B(–) to change it.
xYou can specify a date in the range of January 1, 2000 to December 31,
2099.
4. Press Ato exit the setting screen.
5. Use Ato display either the fishing level screen or the Moon Data screen.
E-23
xYou can also specify a particular date (year, month, day) to view its fishing level
and Moon data. See “To specify a date” (page E-23) for more information.
xWhen you enter the Fishing/Moon Mode, the screen (fishing level or Moon data)
that was displayed the last time you exited the mode appears first.
To specify a date
1. In the Fishing/Moon Mode, hold down Auntil the
year setting starts to flash, which indicates the setting
screen.
2. Press Cto move the flashing in the sequence shown
below to select the other settings.
Year Month Day
C
C
C
Year
Month – Day
E-22
A
Time Moon age
Fishing level indicator Year Month – Day
Moon phase indicator
Fishing Level Screen Moon Data Screen
xWhile the fishing level screen is displayed, press Dto advance to the next
hour.
xWhile the Moon Data screen is displayed, press Dto advance to the next day.
E-21
xThe fishing level indicator changes in accordance with the Moon data.
xIn the Timekeeping Mode, the FISH indicator flashes whenever the fishing level
of the current time is 4 or 5.
To view the current fishing level and Moon data
In the Fishing/Moon Mode, press Ato toggle between the fishing level screen and
the Moon Data screen.
xThe fishing level indicator shows the level for the displayed time. The initial
fishing level screen shows the level for 6:00 a.m. The Moon data screen shows
the Moon age and Moon phase for the current date.
E-20
Fishing Level Indicator
The fishing level indicator shows the relative favorability of a fishing time (calculated
in accordance with Moon transit and phase) as shown in the table below.
Level 5 Level 4 Level 3 Level 2 Level 1
Moon Transit
Moon Phase
Upper
Lower West East Other
New moon*
Full moon Level 5 Level 4 Level 3
First quarter
Last quarter Level 4 Level 3 Level 2
Other Level 3 Level 2 Level 1
* These indicators
actually appear
during Moon ages
13.0 to 16.6 (Full
Moon and phase
immediately
preceding it) and
27.7 to 1.8 (New
Moon and phase
immediately
preceding it).

Operation Guide 5627
E-39
3. Press Cto move the flashing in the sequence shown below to select the other
settings.
DST Hour Minutes
C
C
C
4. When the setting you want to change is flashing, use Band Dto change it as
described below.
Screen To do this: Do this:
Toggle between Daylight Saving Time
(On) and Standard Time (OF)Press D.
Change the hours or minutes Use D(+) and B(–).
5. Press Ato exit the setting screen.
xThe DST indicator on the Dual Time Mode screen indicates that DST is turned
on for the Dual Time Mode time.
E-38
Dual Time
The Dual Time Mode lets you keep track of time in a
different time zone. You can select Standard Time or
Daylight Saving Time for the Dual Time Mode time.
xIn the Dual Time Mode, the seconds count is
synchronized with the seconds count of the current
digital time.
To set the Dual Time
1. Press Cto enter the Dual Time Mode (page E-7).
2. In the Dual Time Mode, hold down Auntil the DST
setting starts to flash, which indicates the setting
screen.
Dual time
(Hour : Minutes)
Timekeeping Mode time
DST indicator
E-37
To select the operation of Alarm 1
1. In the Alarm Mode, use Dto select Alarm 1.
2. Press Ato cycle through the available settings in the sequence shown below.
A
SNZ
A A
Alarm on Snooze
feature on
Alarm off
xThe applicable alarm on indicator (SNZ ) is displayed in all modes when an
alarm is turned on.
xSNZ indicator flashes during the 5-minute intervals between alarms.
xThe alarm indicator ( and/or SNZ) flashes while the alarm is sounding.
E-36
To turn Alarms 2 and 3, and the Hourly Time Signal on and off
1. In the Alarm Mode, use Dto select alarm 2or 3, or the
Hourly Time Signal (:00).
2. Press Ato toggle it on and off.
xTurning on alarm 2or 3displays the alarm on indicator
on its screen.
xTurning on the Hourly Time Signal displays the hourly
time signal on indicator.
xThe alarm on ( ) indicator and Hourly time Signal on
() indicator are displayed in all modes.
Alarm on indicator
Hourly time signal on
indicator
E-35
5. Press Ato exit the setting screen.
Alarm Operation
The alarm tone sounds at the preset time for 10 seconds, regardless of the mode the
watch is in. While the snooze function is turned on, the alarm operation will repeat
every five minutes up to seven times, or until the alarm or snooze function is turned
off.
xTo stop the alarm tone after it starts to sound, press any button.
xPerforming any one of the operations below during a 5-minute interval between
snooze alarms cancels the current snooze alarm operation.
Displaying the Timekeeping Mode setting screen (page E-9)
Displaying the alarm 1setting screen (page E-33)
To test the alarm
In the Alarm Mode, hold down Dto sound the alarm.
E-34
3. Press Cto move the flashing in the sequence shown below to select other
settings.
Hours Minutes Day
C
C
C
Month
C
4. While a setting is flashing, use D(+) and B(–) to change it.
xTo set an alarm that does not include a month (daily alarm, monthly alarm),
set for the month. Use Dand Buntil the mark appears (between 12 and
1) while month setting is flashing.
xTo set an alarm that does not include a day (daily alarm, 1-month alarm), set
for the day. Use Dand Buntil the mark appears (between the end
of the month and 1) while the day setting is flashing.
xWhen setting the alarm time using the 12-hour format, take care to set the
time correctly as a.m. (no indicator) or p.m. (Pindicator).
E-33
To set an alarm time
1. In the Alarm Mode, use Dto scroll through the alarm
screens until the one whose time you want to set is
displayed.
–1 –2 :00
D
D
DD
–3
xAlarm 1has a snooze feature.
xThe snooze alarm operation repeats every five minutes.
2. After you select an alarm, hold down Auntil the hour setting of the alarm time
starts to flash, which indicates the setting screen.
xThis operation automatically turns on the alarm.
E-32
Alarm Types
The alarm type is determined by the settings you make, as described below.
xDaily 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 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.
E-31
Alarms
You can set up to three 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 has a snooze feature.
You can also turn on an Hourly Time Signal that causes
the watch to beep twice every hour on the hour.
xThere are three alarms numbered 1through 3. The
Hourly Time Signal screen is indicated by :00.
xAll of the operations in this section are performed
in the Alarm Mode, which you enter by pressing C
(page E-7).
Alarm time
(Hour : Minutes)
Alarm date (Month – Day)
Alarm number
E-30
3. While a setting is flashing, use Dand Bto change it as described below.
Screen To do this: Do this:
Change the hours or minutes Use D(+) and B(–).
Toggle auto-repeat on (On) and off (OF)Press D.
xTo specify a countdown start time of 24 hours, set 0:00.
4. Press Ato exit the setting screen.
xThe auto-repeat on indicator ( ) is displayed on the Countdown Timer Mode
screen while this function is turned on.
xFrequent use of auto-repeat and the alarm can run down battery power.

Operation Guide 5627
E-49
Battery: One lithium battery (Type: CR1220)
Approximately 3 years on type CR1220 (assuming alarm operation 10 sec./day and
one illumination operation 1.5 sec./day)
Frequent use of the light shortens the battery life.
Specifications are subject to change without notice.
E-48
Countdown Timer
Measuring unit: 1 second
Input range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Other: Auto-repeat timing
Alarms: 3 Multi-function* alarms (1 with snooze feature); Hourly Time Signal
* Alarm type: Daily alarm, Date alarm, 1-month alarm, Monthly alarm
Dual Time: Hour, minutes, seconds, a.m./p.m. (P)
Other: Daylight Saving Time (summer time)/Standard Time
Illumination: LED (light-emitting diode); selectable illumination duration
(approximately 1.5 seconds or 3 seconds)
Other: Button operation tone on/off
E-47
Specifications
Accuracy at normal temperature: ±30 seconds a month
Digital Timekeeping: Hour, minutes, seconds, a.m./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: Daylight Saving Time (summer time)/Standard Time; Home Site data
settings (UTC differential, longitude)
Analog Timekeeping: Hour, minutes (hand moves every 20 seconds)
Fishing/Moon Mode: Fishing level for a specified date and time; Moon phase
indicator and Moon age for a specified date
Stopwatch
Measuring unit: 1/100 second
Measuring capacity: 23:59'59.99"
Measuring modes: Elapsed time, split time, two finishes
E-46
xThe year can be set in the range of 2000 to 2099.
xThe 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.
Illumination Precautions
xIllumination may be hard to see when viewed under direct sunlight.
xIllumination automatically turns off whenever an alarm sounds.
xFrequent use of illumination runs down the battery.
E-45
Auto Return Features
xIf 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.
xIf you leave the watch in the Fishing/Moon Mode, Alarm Mode, and Hand
setting Mode for two or three minutes without performing any operation, it
automatically changes to the Timekeeping Mode.
Scrolling
The Band Dbuttons 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 through the data at high speed.
Timekeeping
xResetting 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.
E-44
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.
xThe multi-function alarms and Countdown Timer Mode
alarm will sound even if the button operation tone is
turned off.
To turn the button operation tone on and off
In any mode (except when a setting screen is on the display), hold down Cto toggle
the button operation tone on ( not displayed) and off ( displayed).
xHolding down Cto turn the button operation tone on or off also causes the
watch’s current mode to change.
xThe indicator is displayed in all modes when the button operation tone is
turned off.
E-43
xThe 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.
xThe 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.
E-42
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.
Moon Phase Indicator
The Moon phase indicator of this watch indicates the current phase of the Moon as
shown below.
(part you cannot see) Moon phase (part you can see)
Moon
Phase
Indicator
Moon Age 0.0 - 1.8
27.7 - 29.5 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
Phase
New
Moon
First
Quarter
(Waxing)
Full
Moon
Last
Quarter
(Waning)
E-41
To specify the illumination duration
1. In the Timekeeping Mode, hold down Auntil the
seconds start to flash, which indicates the setting
screen.
2. While the seconds are flashing, press Bto toggle
the illumination duration between 1.5 seconds ( ) and
3seconds ( ).
3. Press Atwice to exit the setting screen.
E-40
Illumination
Two LEDs (light-emitting diodes) and a light guide panel
illuminate the face of the watch for easy reading in the
dark.
xSee “Illumination Precautions” (page E-46) for more
important information.
To illuminate the face of the watch
In any mode (except when a setting screen is on the
display), press Bto illuminate the face of the watch.
xYou can use the procedure below 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.

Operation Guide 5627
E-59
xUse a soft toothbrush or similar tool to scrub the metal with a weak solution of
water and a mild neutral detergent, or with soapy water. Next, rinse with water
to remove all remaining detergent and then wipe dry with a soft absorbent cloth.
When washing metal components, wrap the watch case with kitchen plastic wrap
so it does not come into contact with the detergent or soap.
Bacteria and Odor Resistant Band
xThe bacteria and odor resistant band protects against odor generated by the
formation of bacteria from sweat, which ensures comfort and hygiene. In order
to ensure maximum bacteria and odor resistance, keep the band clean. Use an
absorbent soft cloth to thoroughly wipe the band clean of dirt, sweat, and moisture.
A bacteria and odor resistant band suppresses the formation of organisms and
bacteria. It does not protect against rash due to allergic reaction, etc.
Liquid Crystal Display
xDisplay figures may be difficult to read when viewed from an angle.
E-58
Leather Band
xAllowing your watch to remain in contact with other items or storing it together with
other items for long periods while it is wet can cause the color of the leather band
to transfer to the other items or the color of the other items to transfer to the leather
band. Be sure to dry off your watch thoroughly with a soft cloth before storing it
and make sure it is not in contact with other items.
xLeaving a leather band where it is exposed to direct sunlight (ultraviolet rays) for
long periods or failure to clean dirt from a leather band for long periods can cause
it to become discolored.
CAUTION: Exposing a leather band to rubbing or dirt can cause color transfer and
discoloration.
Metal Components
xFailure to clean dirt from metal components can lead to formation of rust, even if
components are stainless steel or plated. If metal components exposed to sweat or
water, wipe thoroughly with a soft, absorbent cloth and then place the watch in a
well-ventilated location to dry.
E-57
xLeaving your watch where it is exposed to direct sunlight (ultraviolet rays) for long
periods or failure to clean dirt from your watch for long periods can cause it to
become discolored.
xFriction caused by certain conditions (strong external force, sustained rubbing,
impact, etc.) can cause discoloration of painted components.
xIf there are printed figures on the band, strong rubbing of the printed area can
cause discoloration.
xLeaving your watch wet for long periods can cause fluorescent color to fade. Wipe
the watch dry as soon as possible after it becomes wet.
xSemi-transparent resin parts can become discolored due to sweat and dirt, and if
exposed to high temperatures and humidity for long periods.
xDaily use and long-term storage of your watch can lead to deterioration, breaking,
or bending of resin components. The extent of such damage depends on usage
conditions and storage conditions.
E-56
Chemicals
xDo not allow your watch to come into contact with thinner, gasoline, solvents,
oils, or fats, or with any cleaners, adhesives, paints, medicines, or cosmetics that
contain such ingredients. Doing so can cause discoloration of or damage to the
resin case, resin band, leather, and other parts.
Storage
xIf you do not plan to use your watch for a long time, thoroughly wipe it free of all
dirt, sweat, and moisture, and store it in a cool, dry place.
Resin Components
xAllowing your watch to remain in contact with other items or storing it together with
other items for long periods while it is wet can cause color on resin components
to transfer to the other items, or the color of the other items to transfer to the resin
components of your watch. Be sure to dry off your watch thoroughly before storing
it and make sure it is not in contact with other items.
E-55
Magnetism
xThe hands of analog and combination (analog-digital) watches are moved by a
motor that uses magnetic force. When such a watch is close to a device (audio
speakers, magnetic necklace, cell phone, etc.) that emits strong magnetism, the
magnetism can cause timekeeping to slow down, speed up, or stop, resulting in the
incorrect time being displayed.
xVery strong magnetism (from medical equipment, etc.) should be avoided because
it can cause malfunction of your watch and damage to electronic components.
Electrostatic Charge
xExposure to very strong electrostatic charge can cause your watch to display
the wrong time. Very strong electrostatic charge even can damage electronic
components.
xElectrostatic charge can cause the display to go blank momentarily or cause a
rainbow effect on the display.
E-54
Temperature
xNever leave your watch on the dashboard of a car, near a heater, or in any other
location that is subject to very high temperatures. Do not leave your watch where
it will be exposed to very low temperatures. Temperature extremes can cause your
watch to lose or gain time, to stop, or otherwise malfunction.
xLeaving your watch in an area hotter than +60°C (140°F) for long periods can lead
to problems with its LCD. The LCD may become difficult to read at temperatures
lower than 0°C (32°F) and greater than +40°C (104°F).
Impact
xYour watch is designed to withstand impact incurred during normal daily use and
during light activity such as playing catch, tennis, etc. Dropping your watch or
otherwise subjecting it to strong impact, however, can lead to malfunction. Note
that watches with shock-resistant designs (G-SHOCK, BABY-G, G-MS) can be
worn while operating a chain saw or engaging in other activities that generate
strong vibration, or while engaging in strenuous sports activities (motocross, etc.)
E-53
Band
xTightening the band too tightly can cause you to sweat and make it difficult for air
to pass under the band, which can lead to skin irritation. Do not fasten the band too
tightly. There should be enough room between the band and your wrist so you can
insert your finger.
xDeterioration, rust, and other conditions can cause the band to break or come off
of your watch, which in turn can cause band pins to fly out of position or to fall out.
This creates the risk of your watch falling from your wrist and becoming lost, and
also creates the risk of personal injury. Always take good care of your band and
keep it clean.
xImmediately stop using a band if you even notice any of the following: loss of band
flexibility, band cracks, band discoloration, band looseness, band connecting
pin flying or falling out, or any other abnormality. Take your watch to your original
retailer or to a CASIO service center for inspection and repair (for which you will be
charged) or to have the band replaced (for which you will be charged).
E-52
xA trained technician will inspect your watch for proper water resistance whenever
you have its battery replaced. Battery replacement requires the use of special tools.
Always request battery replacement from your original retailer or from an authorized
CASIO service center.
xSome water-resistant watches come with fashionable leather bands. Avoid
swimming, washing, or any other activity that causes direct exposure of a leather
band to water.
xThe inside surface of the watch glass may fog when the watch is exposed to a
sudden drop in temperature. No problem is indicated if the fogging clears up
relatively quickly. Sudden and extreme temperature changes (such as coming into
an air conditioned room in the summer and standing close to an air conditioner
outlet, or leaving a heated room in the winter and allowing your watch to come into
contact with snow) can cause it to take longer for glass fogging to clear up. If glass
fogging does not clear up or if you notice moisture inside of the glass, immediately
stop using your watch and take it to your original retailer or to an authorized CASIO
service center.
xYour water-resistant watch has been tested in accordance with International
Organization for Standardization regulations.
E-51
xWatches that do not have WATER RESIST or WATER RESISTANT marked on
the back cover are not protected against the effects of sweat. Avoid using such
a watch under conditions where it will be exposed to large amounts of sweat or
moisture, or to direct splashing with water.
xEven if a watch is water resistant, note the usage precautions described below.
Such types of use reduce water resistance performance and can cause fogging of
the glass.
− Do not operate the crown or buttons while your watch is submersed in water or
wet.
− Avoid wearing your watch while in the bath.
− Do not wear your watch while in a heated swimming pool, sauna, or any other
high temperature/high humidity environment.
− Do not wear your watch while washing your hands or face, while doing
housework, or while performing any other task that involves soaps or detergents.
xAfter submersion in seawater, use plain water to rinse all salt and dirt from your
watch.
xTo maintain water resistance, have the gaskets of your watch replaced periodically
(about once every two or three years).
E-50
Operating Precautions
Water Resistance
xThe information below applies to watches with WATER RESIST or WATER
RESISTANT marked on the back cover.
Water
Resistance
Under Daily
Use
Enhanced Water Resistance Under
Daily Use
5
Atmospheres
10
Atmospheres
20
Atmospheres
Marking On watch front or on
back cover
No
BAR mark 5BAR 10BAR 20BAR
Example of
Daily Use
Hand washing, rain Yes Yes Yes Yes
Water-related work, swimming No Yes Yes Yes
Windsurfing No No Yes Yes
Skin diving No No Yes Yes
x Do not use your watch for scuba diving or other types of diving that requires air tanks.
OPUM-E

Operation Guide 5627
E-65
Low Battery Power
xLow battery power is indicated by large timekeeping error, by dim display contents,
or by a blank display.
xOperation while battery power is low can result in malfunction. Replace the battery
as soon as possible.
E-64
Battery Replacement
xLeave battery replacement up to your original retailer or authorized CASIO service
center.
xHave the battery replaced only with the type specified in the User’s Guide. Use of a
different battery type can cause malfunction.
xWhen replacing the battery, also request a check for proper water resistance.
xOrnamental resin components may become worn, cracked, or bent over
time when subjected to normal daily use. Note that if cracking or any other
abnormality indicating possible damage is noticed in a watch submitted for battery
replacement, your watch will be returned with an explanation of the abnormality,
without the requested servicing being performed.
Initial Battery
xThe battery that comes loaded in your watch when you purchase it is used for
function and performance testing at the factory.
xThe test battery may go dead quicker than the normally rated battery life as noted
in the User’s Guide. Note that you will be charged for replacement of this battery,
even if replacement is required within your watch’s warranty period.
E-63
xRust can cause sharp areas on metal components and can cause band pins to fly
out of position or to fall out. If you ever notice any abnormality immediately stop
using your watch and take it to your original retailer or to an authorized CASIO
service center.
xEven if the surface of the metal appears clean, sweat and rust in crevasses can
soil the sleeves of clothing, cause skin irritation, and even interfere with watch
performance.
Premature Wear
xLeaving sweat or water on a resin band or bezel, or storing your watch an area
subject to high moisture can lead to premature wear, cuts, and breaks.
Skin Irritation
xIndividuals with sensitive skin or in poor physical condition may experience skin
irritation when wearing a watch. Such individuals should keep their leather band
or resin band particularly clean. Should you ever experience a rash or other skin
irritation, immediately remove your watch and contact a skin care professional.
E-62
xFor a resin band, wash with water and then wipe dry with a soft cloth. Note that
sometimes a smudge like pattern may appear on the surface of a resin band. This
will not have any effect on your skin or clothing. Wipe with a cloth to remove the
smudge pattern.
xClean water and sweat from a leather band by wiping with a soft cloth.
xNot operating a watch crown, buttons, or rotary bezel could lead to later problems
with their operation. Periodically rotate the crown and rotary bezel, and press
buttons to maintain proper operation.
Dangers of Poor Watch Care
Rust
xThough the metal steel used for your watch is highly rust-resistant, rust can form if
your watch is not cleaned after it becomes dirty.
− Dirt on your watch can make it impossible for oxygen to come into contact with
the metal, which can lead to breakdown of the oxidization layer on the metal
surface and the formation of rust.
E-61
User Maintenance
Caring for Your Watch
Remember that you wear your watch next to your skin, just like a piece of clothing.
To ensure your watch performs at the level for which it is designed, keep it clean by
frequently wiping with a soft cloth to keep your watch and band free of dirt, sweat,
water and other foreign matter.
xWhenever your watch is exposed to sea water or mud, rinse it off with clean fresh
water.
xFor a metal band or a resin band with metal parts, use a soft toothbrush or similar
tool to scrub the band with a weak solution of water and a mild neutral detergent,
or with soapy water. Next, rinse with water to remove all remaining detergent and
then wipe dry with a soft absorbent cloth. When washing the band, wrap the watch
case with kitchen plastic wrap so it does not come into contact with the detergent
or soap.
E-60
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 your watch or
its malfunction.
L-3
Site UTC
Differential Longitude
COLOMBO +5.5 80°E
DAKAR +0 17°W
DALLAS/
FORT WORTH –6 97°W
DAMASCUS +2 36°E
DARWIN +9.5 131°E
DAWSON CITY –8 139°W
DELHI +5.5 77°E
DENVER –7 105°W
DETROIT –5 83°W
DHAKA +6 90°E
DUBAI +4 55°E
DUBLIN +0 6°W
Site UTC
Differential Longitude
EDMONTON –7 114°W
EL PASO –7 106°W
FRANKFURT +1 9°E
GUAM +10 145°E
HAMBURG +1 10°E
HANOI +7 106°E
HAVANA –5 82°W
HELSINKI +2 25°E
HONG KONG +8 114°E
HONOLULU –10 158°W
HOUSTON –6 95°W
ISTANBUL +3 29°E
JAKARTA +7 107°E
L-2
Site Data List
Site UTC
Differential Longitude
ABIDJAN +0 4°W
ABU DHABI +4 54°E
ADDIS ABABA +3 39°E
ADELAIDE +9.5 139°E
ADEN +3 45°E
ALGIERS +1 3°E
AMSTERDAM +1 5°E
ANCHORAGE –9 149°W
ATHENS +2 24°E
AZORES –1 25°W
BANGKOK +7 101°E
BEIJING +8 116°E
Site UTC
Differential Longitude
BEIRUT +2 36°E
BERLIN +1 13°E
BOGOTA –5 74°W
BOSTON –5 71°W
BRASILIA –3 48°W
BUENOS AIRES –3 58°W
CAIRO +2 31°E
CAPE TOWN +2 18°E
CARACAS –4 67°W
CASABLANCA +0 8°W
CHICAGO –6 88°W
CHRISTCHURCH +12 173°E
L-1
Site Data List

Operation Guide 5627
L-6
Site UTC
Differential Longitude
SINGAPORE +8 104°E
STOCKHOLM +1 18°E
SYDNEY +10 151°E
TAIPEI +8 121°E
TEHRAN +3.5 51°E
TOKYO +9 140°E
ULAANBAATAR +8 107°E
VANCOUVER –8 123°W
VIENNA +1 16°E
VIENTIANE +7 103°E
YANGON +6.5 96°E
WELLINGTON +12 175°E
WINNIPEG –6 97°W
xBased on data as of 2019.
L-5
Site UTC
Differential Longitude
NAIROBI +3 37°E
NAURU ISLAND +12 167°E
NEW ORLEANS –6 90°W
NEW YORK –5 74°W
NOME –9 165°W
NOUMEA +11 166°E
PAGO PAGO –11 171°W
PANAMA CITY –5 80°W
PAPEETE –10 150°W
PARIS +1 2°E
PERTH +8 116°E
PHNOM PENH +7 105°E
PORT OF SPAIN –4 62°W
Site UTC
Differential Longitude
PORT VILA +11 168°E
PRAIA –1 24°W
PYONGYANG +9 126°E
RABAUL +10 152°E
RIO DE JANEIRO –3 43°W
RIYADH +3 47°E
ROME +1 13°E
SAN FRANCISCO –8 122°W
SANTIAGO –4 71°W
SAO PAULO –3 47°W
SEATTLE –8 122°W
SEOUL +9 127°E
SHIRAZ +3.5 53°E
L-4
Site UTC
Differential Longitude
JEDDAH +3 39°E
JERUSALEM +2 35°E
KABUL +4.5 69°E
KARACHI +5 67°E
KOLKATA +5.5 88°E
KUALA LUMPUR +8 102°E
KUWAIT +3 48°E
LA PAZ –4 68°W
LAS VEGAS –8 115°W
LIMA –5 77°W
LISBON +0 9°W
LONDON +0 0°E
LOS ANGELES –8 118°W
Site UTC
Differential Longitude
MADRID +1 4°W
MALE +5 74°E
MANILA +8 121°E
MELBOURNE +10 145°E
MEXICO CITY –6 99°W
MIAMI –5 80°W
MILAN +1 9°E
MONTEVIDEO –3 56°W
MONTREAL –5 74°W
MOSCOW +3 38°E
MUMBAI +5.5 73°E
MUSCAT +4 59°E
NADI +12 177°E