MA1903-EA
© 2019 CASIO COMPUTER CO., LTD.
Operation Guide 3473/3474
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.
x Be sure to keep all user documentation handy for future reference.
x 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.
x 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.
x 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!
E-1
About This Manual
x The operational procedures for Modules 3473 and 3474 are identical. All of the
illustrations in this manual show Module 3473.
x The module number is engraved on the back cover of the watch case.
Alarm on indicator
E-2
Hourly time
signal on
indicator
Module 3473 Module 3474
Alarm on indicator
Hourly time
signal on
indicator
Contents
Getting Acquainted ............................................................................................ E-1
General Guide ..................................................................................................... E-8
Timekeeping ..................................................................................................... E-10
To set the time and date ............................................................................... E-11
To toggle the Timekeeping Mode time between DST and Standard Time .... E-14
To configure Home Site data ........................................................................ E-17
To toggle between 12-hour and 24-hour timekeeping .................................. E-19
Moon/Tide Data ................................................................................................ E-20
To view the current Moon/Tide Data Mode data .......................................... E-21
To specify a date .......................................................................................... E-23
E-4
Illumination ....................................................................................................... E-40
To illuminate the display ...............................................................................E-40
To specify the illumination duration .............................................................. E-41
Reference ......................................................................................................... E-42
To turn the button operation tone on and off ................................................ E-46
Specifications ................................................................................................... E-49
Operating Precautions ..................................................................................... E-52
User Maintenance ............................................................................................ E-62
x Button operations are indicated using the letters shown in the illustration.
x Note that the product illustrations in this manual are intended for reference only,
and so the actual product may appear somewhat different than depicted by an
illustration.
x 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.
x To 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”.
Stopwatch ......................................................................................................... E-24
To measure times with the stopwatch .......................................................... E-25
Countdown Timer............................................................................................. E-26
To use the countdown timer ......................................................................... E-27
To set up the countdown timer ..................................................................... E-28
Alarms ............................................................................................................... E-30
To set an alarm time .....................................................................................E-32
To test the alarm ........................................................................................... E-34
To turn Alarms 2 and 3, and the Hourly Time Signal on and off.................... E-35
To select the operation of Alarm 1 ................................................................ E-36
Dual Time .......................................................................................................... E-37
To set the Dual Time ..................................................................................... E-38
E-3
E-5
General Guide
x Press C to change from mode to mode.
x In any mode (except when a setting screen is on the display), press B to illuminate
the face of the watch.
Timekeeping Mode Moon/Tide Data Mode Stopwatch Mode
C
E-8
C C
E-7E-6
Countdown Timer Mode Alarm Mode
C C
Dual Time Mode
C
E-9
Operation Guide 3473/3474
Timekeeping
PM indicator
Day of week
Month – Day
Seconds
Tide graph
Hour : Minutes
Moon phase indicator
E-10
3. When the setting you want to change is flashing, use B and D to change it as
described below.
Screen To do this: Do this:
Reset the seconds to 00
Toggle between Daylight Saving Time (On) and
Standard Time (OF)
Change the hour or minutes
Change the year
Change the month or day
E-12
To toggle the Timekeeping Mode time between DST and Standard Time
DST indicator
On/Off status
E-14
Use the Timekeeping Mode to set and view the current
time and date.
x The Moon phase indicator (page E-42) shows the
current Moon phase in accordance with the current
date as kept in the Timekeeping Mode.
x The tide graph (page E-44) shows tidal movements for
the current date in accordance with the current time as
kept in the Timekeeping Mode.
Important!
x 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” (page E-15) for more
information.
Press D.
Press D.
Use D (+) and B (–).
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C once to display the DST setting screen.
3. Press D to toggle between Daylight Saving Time (On
displayed) and Standard Time (OF displayed).
4. Press A twice to exit the setting screen.
x The DST indicator appears on the Timekeeping,
Moon/Tide Data, and Alarm Mode screens to indicate
that Daylight Saving Time is turned on. In the case of
the Moon/Tide Data Mode, the DST indicator appears
on the tide data screen only.
To set the time and date
Seconds
4. Press A twice to exit the setting screen.
x The first press of A displays the UTC differential setting screen. Pressing A
again exits the setting screen.
x See “Daylight Saving Time (DST) Setting” below for details about the DST
setting.
x The day of the week is displayed automatically in accordance with the date
(year, month, and day) settings.
Daylight Saving Time (DST) Setting
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.
Home Site Data
Moon phase, tide graph data, and Moon/Tide Data Mode data will not be displayed
properly unless Home Site data (UTC differential, longitude, and lunitidal interval) is
configured correctly.
x The 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.
x 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.
x 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” (page
E-45) for more information.
x This watch displays lunitidal intervals in terms of hours and minutes.
x The “Site/Lunitidal Interval Data List” at the back of this manual provides UTC
differential and longitude information around the world.
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press C to move the flashing in the sequence shown
below to select the other settings.
CC
Day YearMonth
CC
C
MinutesHourDST
CC
E-11
E-13
E-15
x 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 differential (+9.0); Longitude (East 140 degrees); Lunitidal interval (5 hours,
20 minutes)
E-16
4. When the setting you want to change is flashing, use D and B to change it as
described below.
Setting Screen Button Operations
UTC Differential
Longitude Value
East Longitude/
West Longitude
Lunitidal Interval Hours,
Minutes
x When the DST setting is on, the UTC differential can be set in a range of –11.0
to +15.0 in 0.5-hour units.
Use D (+) and B (–) to change the setting.
x You can specify a value in the range of –12.0 to
+14.0, in 0.5-hour units.
Use D (+) and B (–) to change the setting.
x You can specify a value in the range of 0° to 180°,
in 1-degree units.
Use D to switch between east longitude (E) and
west longitude (W).
Use D (+) and B (–) to change the setting.
5. Press A to exit the setting screen.
E-18
To configure Home Site data
UTC differential
UTC Differential
C
Lunitidal Interval Minutes Lunitidal Interval Hours
To toggle between 12-hour and 24-hour timekeeping
In the Timekeeping Mode, press D to toggle between 12-hour timekeeping and
24-hour timekeeping.
x 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 the A (AM) indicator appears to
the left of the hour digits for times in the range of midnight to 11:59 a.m.
x With the 24-hour format, times are displayed in the range of 0:00 to 23:59, without
any indicator.
x The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode is
applied in all other modes.
x The A and P indicators are not displayed with the Timekeeping Mode time on the
Countdown Timer Mode and Dual Time Mode screens.
1. In the Timekeeping Mode, hold down A until the
seconds start to flash, which indicates the setting
screen.
2. Press A again to display the UTC differential setting
screen.
3. Press C to move the flashing in the sequence shown
below to select other settings.
C
Longitude Value
C
East Longitude/
West Longitude
C
C
E-17
E-19
Operation Guide 3473/3474
Moon/Tide Data
Tide Data Screen
Month – Day
Year
Tide graph
Moon phase indicator
E-20
Year
Month – Day
x While the tide data screen is displayed, press D to advance to the next hour.
x While the Moon data screen is displayed, press D to advance to the next day.
x You can also specify a particular date (year, month, day) to view its tide data and
Moon data. See “To specify a date” for more information.
x When you enter the Moon/Tide Data Mode, the screen (tide data or Moon data)
that was displayed the last time you exited the mode appears first.
E-22
Moon/tide 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.
x If you suspect that the current Moon/tide data is wrong
Time
for some reason, check the current Timekeeping Mode
settings (time, date, and Home Site), and correct them
if required.
x See “Moon Phase Indicator” (page E-42) for information
about the Moon phase indicator and “Tide Graph” (page
E-44) for information about the tide graph.
x All of the operations in this section are performed in the
Moon/Tide Data Mode, which you enter by pressing C
(page E-8).
Tide Data Screen Moon Data Screen
A
Tide graph
Time
Moon age
Moon phase indicator
Year
Month – Day
Stopwatch
1/100 second
Hours
Minutes
E-24
The stopwatch lets you measure elapsed time, split
times, and two finishes.
x The display range of the stopwatch is 23 hours,
59minutes, 59.99 seconds.
x The stopwatch continues to run, restarting from zero
after it reaches its limit, until you stop it.
x An ongoing elapsed time measurement operation will
continue internally even if you change to another mode.
However, if you exit the Stopwatch Mode while a split
time is displayed, the split time will not be displayed
when you return to the Stopwatch Mode.
Seconds
x All of the operations in this section are performed in
the Stopwatch Mode, which you enter by pressing C
(page E-8).
To view the current Moon/Tide Data Mode data
In the Moon/Tide Data Mode, press A to toggle between the tide data screen and
the Moon data screen.
x The tide graph shows the tide for the currently displayed time. The initial tide data
screen shows the level for 6:00 a.m. The Moon data screen shows the Moon age
and Moon phase for the current date.
x If you are using 12-hour timekeeping, P (p.m.) or A (a.m.) will be indicated for the
times on tide data screens.
E-21
To specify a date
Month – Day
Year
3. While a setting is flashing, use D (+) or B (–) to change it.
x You can specify a date in the range of January 1, 2000 to December 31, 2099.
1. In the Moon/Tide 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.
CCC
Year DayMonth
4. Press A to exit the setting screen.
5. Use A to display either the tide data screen or the Moon data screen.
E-23
To measure times with the stopwatch
Elapsed Time
D D D D A
Start Stop Resume Stop Clear
Split Time
D
Start Split
A A D A
(SPL displayed)
Split release Stop Clear
Two Finishes
D
Start Split
A D A A
First runner
finishes.
Display time of
first runner.
Stop
Second runner
finishes.
Split release
Display time of
second runner.
Clear
E-25
Countdown Timer
Timekeeping Mode time
Hours
Minutes
E-26
To set up the countdown timer
E-28
You can set the countdown timer within a range of
one minute to 24 hours. An alarm sounds when the
countdown reaches zero.
x You can also select auto-repeat, which automatically
restarts the countdown from the original value you set
whenever zero is reached.
x All of the operations in this section are performed in the
Countdown Timer Mode, which you can enter using C
(page E-9).
Seconds
1. While the countdown start time is on the display in the
Countdown Timer Mode, hold down A until the hour
setting of the countdown start time starts to flash,
which indicates the setting screen.
x If the countdown start time is not displayed, use the
2. Press C to move the flashing in the sequence shown
below to select other settings.
Hours Auto-repeat
procedure under “To use the countdown timer” to
display it.
CCC
Minutes
To use the countdown timer
Press D while in the Countdown Timer Mode to start the countdown timer.
x When 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.
x When auto-repeat is turned on, the countdown will restart automatically without
pausing when it reaches zero. The alarm sounds in order to signal when the
countdown reaches zero.
x The countdown timer measurement operation continues even if you exit the
Countdown Timer Mode.
x Press D while a countdown operation is in progress to pause it. Press D again to
resume the countdown.
x To completely stop a countdown operation, first pause it (by pressing D), and
then press A. This returns the countdown time to its starting value.
3. While a setting is flashing, use D and B to change it as described below.
Screen To do this: Do this:
Change the hours or minutes
Toggle auto-repeat on (On) and off (OF)
Use D (+) and B (–).
Press D.
x To specify a countdown start time of 24 hours, set 0:00.
4. Press A to exit the setting screen.
x The auto-repeat on indicator ( ) is displayed on the Countdown Timer Mode
screen while this function is turned on.
x Frequent use of auto-repeat and the alarm can run down battery power.
E-27
E-29
Operation Guide 3473/3474
Alarms
Alarm date (Month – Day)
Alarm time
(Hour : Minutes)
Alarm number
E-30
To set an alarm time
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.
x This operation automatically turns on the alarm.
E-32
5. Press A to 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.
x To stop the alarm tone after it starts to sound, press any button.
x Performing 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-11)
Displaying the alarm 1 setting screen (page E-32)
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
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 every hour on the hour.
x There are three alarms numbered 1 through 3. The
Hourly Time Signal screen is indicated by :00.
x All of the operations in this section are performed in
the Alarm Mode, which you enter by pressing C (page
E-9).
1. In the Alarm Mode, use D to scroll through the alarm
screens until the one whose time you want to set is
displayed.
DD
x Alarm 1 has a snooze feature.
x The snooze alarm operation repeats every five
minutes.
DD
-1
:00
-2
-3
Alarm Types
The alarm type is determined by the settings you make, as described below.
x 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.
x 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.
x 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.
x 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
3. Press C to move the flashing in the sequence shown below to select other
settings.
4. While a setting is flashing, use D (+) and B (–) to change it.
x To set an alarm that does not include a month (daily alarm, monthly alarm), set
for the month. Use D and B until the mark appears (between 12 and 1)
while month setting is flashing.
x To set an alarm that does not include a day (daily alarm, 1-month alarm), set
for the day. Use D and B until the
month and 1) while the day setting is flashing.
x If you are using 12-hour timekeeping, P (p.m.) or A (a.m.) will be indicated for
alarm times.
x When setting an alarm time using 12-hour timekeeping, take care to set the time
correctly as a.m. (A indicator) or p.m. (P indicator).
To turn Alarms 2 and 3, and the Hourly Time Signal on and off
1. In the Alarm Mode, use D to select alarm number 2 or 3, or the Hourly Time
Signal.
2. Press A to toggle it on and off.
x Turning on alarm 2 or 3 displays the alarm on indicator.
x Turning on the Hourly Time Signal displays the hourly time signal on indicator.
x The alarm on (ALM) indicator and hourly time signal on (SIG) indicator are
displayed in all modes.
C C
Hour DayMonth
Alarm on indicator
Minutes
C
mark appears (between the end of the
Hourly time signal
on indicator
C
E-33
E-34
To select the operation of Alarm 1
1. In the Alarm Mode, use D to select Alarm 1.
2. Press A to cycle through the available settings in the sequence shown below.
x The applicable alarm on indicator (SNZ ALM) is displayed in all modes when an
alarm is turned on.
x SNZ indicator flashes during the 5-minute intervals between alarms.
x Displaying the Alarm 1 setting screen (page E-32) while the snooze alarm is
turned on automatically turns off the snooze feature.
E-36
To set the Dual Time
Timekeeping Mode time
DST indicator
Dual time (Hour : Minutes)
E-38
AA
ALM
Alarm on Alarm off
SNZ ALM
feature on
1. Press C to enter the Dual Time Mode (page E-9).
2. In the Dual Time Mode, hold down A until the DST
setting starts to flash, which indicates the setting
screen.
3. Press C to move the flashing in the sequence shown
below to select the other setttings.
DST MinutesHour
A
Snooze
CCC
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.
x In the Dual Time Mode, the seconds count is synchronized with the seconds count
of the Timekeeping Mode.
4. When the setting you want to change is flashing, use B and D to change it as
described below.
Screen To do this: Do this:
Toggle between Daylight Saving Time (On) and
Standard Time (OF)
Change the hour or minutes
x If you are using 12-hour timekeeping, P (p.m.) or A (a.m.) will be indicated for
the time.
5. Press A to exit the setting screen.
x The DST indicator on the Dual Time Mode screen indicates that DST is turned
on for the Dual Time Mode time.
Press D.
Use D (+) and B (–).
E-35
E-37
E-39
Operation Guide 3473/3474
Illumination
The watch has an LED light that you can turn on for reading in the dark.
x See “Illumination Precautions” (page E-48) for more important information.
To illuminate the display
In any mode, press B to turn on illumination.
x You 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.
E-40
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.
Moon
Phase
Indicator
Moon Age
Moon
Phase
E-42
Tide Graph
The 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.
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.
E-44
(part you cannot see) Moon phase (part you can see)
0.0-1.8
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
27.7-29.5
New
Moon
(Rising Tide)
First
Quarter
(Waxing)
High Tide
Full
Moon
(Falling Tide)
Last
Quarter
(Waning)
Low Tide
To specify the illumination duration
x 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.
x 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.
x 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.
1. 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 illumination duration between 1.5seconds (
3seconds (
3. Press A twice to exit the setting screen.
).
) and
E-41
E-43
E-45
Button Operation Tone
To turn the button operation tone on and off
In any mode (except when a setting screen is on the display), hold down C to
toggle the button operation tone on (
x Holding down C to turn the button operation tone on or off also causes the
watch’s current mode to change.
x The indicator is displayed in all modes when the button operation tone is
turned off.
E-46
Timekeeping
x 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.
x The year can be set in the range of 2000 to 2099.
x 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.
Illumination Precautions
x Illumination may be diffi cult to see when viewed under direct sunlight.
x Illumination turns off automatically whenever an alarm sounds.
x Frequent use of illumination runs down the battery.
E-48
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.
x Even if you turn off the button operation tone, the alarm,
Hourly Time Signal, and Countdown Timer Mode alarm
all operate normally.
not displayed) and off ( displayed).
Auto Return Features
x 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.
x If you leave the watch in the Moon/Tide Data or Alarm Mode for two or three
minutes without performing any operation, it automatically changes to the
Timekeeping Mode.
Scrolling
The B and D buttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a
scroll operation scrolls through the data at high speed.
Specifications
Accuracy at normal temperature: ±30 seconds a month
Timekeeping: Hour, minutes, seconds, a.m. (A)/p.m. (P), month, day, day of the
Time format: 12-hour and 24-hour
Calendar system: Full Auto-calendar pre-programmed from the year 2000 to
Other: Daylight Saving Time (summer time)/Standard Time; Home Site data
Moon/Tide Data: Tide level for a specified date and time; Moon phase indicator
Stopwatch
Measuring unit: 1/100 second
Measuring capacity: 23:59'59.99"
Measuring modes: Elapsed time, split time, two finishes
week
2099
settings (UTC differential, longitude, lunitidal interval)
and Moon age for a specified date
E-47
E-49
Operation Guide 3473/3474
Countdown Timer
Measuring unit: 1 second
Input range: 1 minute to 24 hours (1-minute increments and 1-hour increments)
Time up alert duration: 10 seconds
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
Alert duration: 10 seconds
Dual Time: Hour, minutes, seconds, a.m. (A)/p.m. (P)
Other: Daylight Saving Time (summer time)/Standard Time
Illumination: LED (light-emitting diode); selectable illumination duration
Other: Button operation tone on/off
E-50
(approximately 1.5 seconds or 3 seconds)
Operating Precautions
Water Resistance
x The information below applies to watches with WATER RESIST or WATER
RESISTANT marked on the back cover.
Water
On watch front or on
Marking
back cover
Hand washing, rain Yes Yes Yes Yes
Water-related work, swimming
Example of
Daily Use
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.
E-52
x A 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.
x Some 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.
x The 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.
x Your water-resistant watch has been tested in accordance with International
Organization for Standardization regulations.
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Resistance
Under Daily
Use
Enhanced Water Resistance Under
Daily Use
5
Atmospheres
No
BAR mark
5BAR 10BAR 20BAR
No Yes Yes Yes
10
Atmospheres
20
Atmospheres
OPUM-E
Battery:
Module 3473: One lithium battery (Type: CR2025)
Approximately 10 years on type CR2025 (assuming alarm operation 10 sec./day
and one illumination operation 1.5 sec./day)
Module 3474: One lithium battery (Type: CR1620)
Approximately 5 years on type CR1620 (assuming alarm operation 10 sec./day
and one illumination operation 1.5 sec./day)
Frequent illumination shortens the battery life.
Specifications are subject to change without notice.
x Watches 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.
x Even 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.
x After submersion in seawater, use plain water to rinse all salt and dirt from your
watch.
x To maintain water resistance, have the gaskets of your watch replaced periodically
(about once every two or three years).
Band
x Tightening 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.
x Deterioration, 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.
x Immediately 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-51
E-53
E-55
Temperature
x Never 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.
x Leaving 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
x Your 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-56
Storage
x If 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
x Allowing 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.
x Leaving 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.
x Friction caused by certain conditions (strong external force, sustained rubbing,
impact, etc.) can cause discoloration of painted components.
x If there are printed figures on the band, strong rubbing of the printed area can
cause discoloration.
E-58
Magnetism
x Though a digital watch normally is not affected by magnetism, very strong
magnetism (from medical equipment, etc.) should be avoided because it can cause
malfunction and damage to electronic components.
Electrostatic Charge
x Exposure to very strong electrostatic charge can cause your watch to display
the wrong time. Very strong electrostatic charge even can damage electronic
components.
x Electrostatic charge can cause the display to go blank momentarily or cause a
rainbow effect on the display.
Chemicals
x Do 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.
x Leaving your watch wet for long periods can cause fluorescent color to fade. Wipe
the watch dry as soon as possible after it becomes wet.
x Semi-transparent resin parts can become discolored due to sweat and dirt, and if
exposed to high temperatures and humidity for long periods.
x Daily 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.
Leather Band
x Allowing 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.
E-57
E-59
Operation Guide 3473/3474
x Leaving 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
x Failure 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.
x Use 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.
E-60
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.
x Whenever your watch is exposed to sea water or mud, rinse it off with clean fresh
water.
x For 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-62
x Rust 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.
x Even 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
x Leaving 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
x Individuals 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-64
Bacteria and Odor Resistant Band
x The 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
x Display figures may be difficult to read when viewed from an angle.
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.
x For 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.
x Clean water and sweat from a leather band by wiping with a soft cloth.
x Not 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
x Though 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.
Battery Replacement
x Leave battery replacement up to your original retailer or authorized CASIO service
center.
x Have the battery replaced only with the type specified in the User’s Guide. Use of a
different battery type can cause malfunction.
x When replacing the battery, also request a check for proper water resistance.
x Ornamental 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
x The battery that comes loaded in your watch when you purchase it is used for
function and performance testing at the factory.
x The 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-61
E-63
E-65
Low Battery Power
x Low battery power is indicated by large timekeeping error, by dim display contents,
or by a blank display.
x Operation while battery power is low can result in malfunction. Replace the battery
as soon as possible.
E-66
Site/Lunitidal Interval Data List
Site
Anchorage –9 149°W 5:40
Bahamas –5 77°W 7:30
Baja, California –7 110°W 8:40
Bangkok +7 101°E 4:40
Boston –5 71°W 11:20
Buenos Aires –3 58°W 6:00
Casablanca +0 8°W 1:30
Christmas Island +14 158°W 4:00
Dakar +0 17°W 7:40
Gold Coast +10 154°E 8:30
Great Barrier Reef, Cairns +10 146°E 9:40
Guam +10 145°E 7:40
L-2
UTC Differential
Standard Time
Longitude Lunitidal Interval
Site/Lunitidal Interval Data List
Site
Hamburg +1 10°E 4:50
Hong Kong +8 114°E 9:10
Honolulu –10 158°W 3:40
Jakarta +7 107°E 0:00
Jeddah +3 39°E 6:30
Karachi +5 67°E 10:10
Kona, Hawaii –10 156°W 4:00
Lima –5 77°W 5:20
Lisbon +0 9°W 2:00
London +0 0°E 1:10
Los Angeles –8 118°W 9:20
Maldives +5 74°E 0:10
Manila +8 121°E 10:30
UTC Differential
Standard Time
Longitude Lunitidal Interval
L-1
L-3
Operation Guide 3473/3474
Site
Mauritius +4 57°E 0:50
Melbourne +10 145°E 2:10
Miami –5 80°W 7:30
Noumea +11 166°E 8:30
Pago Pago –11 171°W 6:40
Palau +9 135°E 7:30
Panama City –5 80°W 3:00
Papeete –10 150°W 0:10
Rio De Janeiro –3 43°W 3:10
Seattle –8 122°W 4:20
Shanghai +8 121°E 1:20
Singapore +8 104°E 10:20
Sydney +10 151°E 8:40
L-4
UTC Differential
Standard Time
Longitude Lunitidal Interval
Site
Tokyo +9 140°E 5:20
Vancouver –8 123°W 5:10
Wellington +12 175°E 4:50
x
The contents of the above table are current as of January 2019.
x
The rules governing global times (UTC offset and GMT differential) and summer
time are determined by each individual country.
UTC Differential
Standard Time
Longitude Lunitidal Interval
L-5
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