Casio G-SHOCK FROGMAN GW-8230 User manual

Precautions
Operating Precautions
●Water Resistance
●A diver’s watch is designed to withstand
pressure up to 200 meters. Do not wear this
watch at depths greater than the depth
marked on it. It can be worn while skin
diving, scuba diving, etc. Do not use a
diver’s watch for deep diving (diving with a
gas mixture) or at a depth greater than that
indicated.
●Do not operate the crown while the watch is
submerged.
●After submersion in seawater, use plain
water to rinse all salt and dirt from your
watch.
●To maintain water resistance, be sure to
have the gaskets of your watch replaced
regularly (once every two years).
●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.
●Your diver’s watch has been tested in
accordance with International Organization
for Standardization regulations.
●Precautions before Diving
●Check to make sure that all watch functions
are working properly.
●Check to make sure the battery is charged
sufficiently.
ー
Before using the watch for diving, charge
its battery up to Level 2.
●Do not over-use display illumination while
diving. Doing so can cause your watch to
disable illumination and alarms in order to
conserve battery power.
●Check to make sure that the current time
setting is correct.
●Check the watch glass for scratching,
cracking, fogging, and other abnormalities.
●Check the case and band for damage and
other abnormalities. Also, ensure that the
band is securely tightened.
●Precautions while Diving
●Take care so your watch does not come into
contact with rocks and other hard items.
●Band
●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.
●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.
●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).
●Temperature
●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.
●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
●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.)
●Magnetism
●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
●Exposure to very strong electrostatic
charge can cause your watch to display the
wrong time. Very strong electrostatic
charge even can damage electronic
components.
●Electrostatic charge can cause the display
to go blank momentarily or cause a rainbow
effect on the display.
●Chemicals
●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.
●Storage
●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.
Watch Operation Guide 3521
2

●Resin Components
●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.
●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.
●Friction caused by certain conditions
(strong external force, sustained rubbing,
impact, etc.) can cause discoloration of
painted components.
●If there are printed figures on the band,
strong rubbing of the printed area can cause
discoloration.
●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.
●Semi-transparent resin parts can become
discolored due to sweat and dirt, and if
exposed to high temperatures and humidity
for long periods.
●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
●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.
●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
●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.
●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.
●Bacteria and Odor Resistant Band
●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
●Display figures may be difficult to read when
viewed from an angle.
●Watch with Data Memory
●Allowing the battery to go dead, replacing
the battery, or having your watch repaired
can cause all data in watch memory to be
lost. Note that CASIO Computer Co., Ltd.
assumes no responsibility for any damages
or losses caused by data lost due to
malfunction or repair of your watch,
replacement of the battery, etc. Be sure to
keep separate written copies of all
important data.
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.
Watch Operation Guide 3521
3

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.
●Whenever your watch is exposed to sea
water or mud, rinse it off with clean fresh
water.
●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.
●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.
●Clean water and sweat from a leather band
by wiping with a soft cloth.
●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
●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.
ー
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.
●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.
●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
●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
●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.
Battery
●The special rechargeable battery used by
your watch is not intended to be removed or
replaced by you. Use of a rechargeable
battery other than the special one specified
for your watch can damage your watch.
●The rechargeable (secondary) battery is
charged when the solar panel is exposed to
light, so it does not require regular
replacement as the primary battery
requires. Note, however, that long use or
operating conditions can cause the
capacity or charging efficiency of the
rechargeable battery to deteriorate. If you
feel that the amount of operation provided
by charging is too short, contact your
original retailer or CASIO service center.
Watch Operation Guide 3521
4

Before Getting
Started...
This section provides an overview of the watch
and introduces convenient ways it can be
used.
Important!
●This watch is not a special-purpose
measuring instrument. Measurement
function readings are intended for
general reference only.
●It can be used while skin diving, scuba
diving, etc.
lUsing the Dive Function
●Watch Features
●Solar Charging
Sunlight and artificial light generate
electricity for watch operation as it charges.
●Dive Function
You can use this function to measure your
dive times and surface intervals. You can
also view dive logs, and record dates and
times. You can delete data as required.
●Tide Level and Moon Age
You can look up the tide level and Moon age
on a date and time you specify.
●World Time
World Time displays the current time in any
of 31 time zones around the globe.
●Alarm
An alarm sounds whenever a time specified
by you is reached.
●Stopwatch
You can use the stopwatch to measure up
to 24 hours of elapsed time in units of 1/100
of a second.
●Timer
Countdown from a start time specified by
you. An alarm sounds when the countdown
reaches zero.
Note
●The illustrations included in this
operation guide have been created to
facilitate explanation. An illustration
may differ somewhat from the item it
represents.
General Guide
④
① ②
③⑤
A Moon Graph
B Tide Graph
C Day of the week
D Hour, minute, second
E Month, day
A button
Holding down this button for at least two
seconds in any mode displays the setting
screen.
B button
Press to turn on illumination.
C button
Each press cycles between watch modes.
D button
Pressing this button while any setting screen
is displayed will change the setting.
Indicators
⑫
⑧
⑨⑩ ⑪
⑭
⑬
⑦
①
③
②
⑤⑥④
A Shows a Tide Graph (tide level) at the
current time.
B Shows the Moon Graph (Moon phase) of
the current date.
C Displayed while the snooze alarm is
turned on.
D Displayed while an alarm is turned on.
E Displayed while the hourly time signal is
enabled.
F Displayed while the button operation tone
is disabled.
G Displayed while Auto Light is enabled.
H Displayed while the watch is indicating
summer time.
I Displayed while Power Saving is enabled.
J Flashes when battery power is low.
K Displayed while in the Dive Mode.
L Displayed while in the Log Data Recall
Mode.
M Shows the current charge level.
N Displayed during p.m. times while 12-hour
timekeeping is being used.
Watch Operation Guide 3521
5

Navigating Between Modes
Each press of (C) cycles between watch
modes.
●In any mode*, hold down (C) for at least one
second to enter the Dive Mode.
* Except the Dive Mode
C
C
C
CC
C
C
C
C
World Time Mode
Timer Mode
Tide Graph/
Moon Graph Mode
Alarm Mode
Dive Mode
Timekeeping Mode
(At least 1 second)(At least 1 second)
Log Data Recall Mode
Stopwatch Mode
Selecting a Timekeeping
Mode Digital Display Format
Each press of (A) in the Timekeeping Mode
toggles between the display information as
shown below.
Day of the
week
Month,
day
World Time City
Current World Time
Hour, minute, second
Charging
This watch runs on power supplied from a
rechargeable (secondary) battery that is
charged by a solar panel. The solar panel is
integrated into the face of the watch, and
power is generated whenever the face is
exposed to light.
●Charging the Watch
When you are not wearing the watch, put it in
a location where it is exposed to bright light.
While you are wearing the watch, make sure
that its face (solar panel) is not blocked from
light by the sleeve of your clothing. Power
generation efficiency is reduced even when
the face of the watch is blocked only partially.
NOYES
Important!
●Some light sources and environments
can cause the watch to become
extremely hot during charging, which
creates the risk of burn injury and
damage to internal watch
components.
Avoid charging the watch under
conditions like the ones described
below, where the temperatures may
exceed 60 °C (140 °F).
ー
On the dashboard of a vehicle
parked in the sun
ー
Near incandescent lamps, camera
lights, halogen lamps, or other
sources of heat
ー
In locations exposed to direct
sunlight for long periods and other
hot locations
●The display panel may become black
(or white, depending on the LCD type)
under very high temperatures. This is
temporary, and the display will return
to normal at lower temperatures.
Watch Operation Guide 3521
6

●Checking the Charge Level
A display indicator shows the watch’s current
charge level.
Charge Level 1: Good
All functions enabled.
Charge Level 2: Good
All functions enabled.
Charge Level 3: Low
[L] flashes on the display, and the functions
below become disabled.
●Dive Mode
●Face illumination
●Sounds (alarm, etc.)
Charge Level 4: Low
When the battery charge drops lower than
Level 3, [CHG] starts to flash on the display
and all functions become disabled.
Charge Level 5: Dead
The digital display will go blank if the battery
goes dead. Memory data is lost, and watch
settings are returned to their initial factory
defaults.
Important!
●Should the battery go low or go dead,
expose the face (solar panel) to light as
soon as possible.
Note
●When [H], [M], and [L] are all flashing
on the display, it means that all
functions are disabled due to
momentary battery power
consumption.
l[H], [M], and [L] are flashing on the
display.
●Charging Time Guidelines
The table below shows guidelines for
approximate charging times.
Charging Times Required for 1 Day of
Operation
Light Level (Lux) Approximate
Charging Time
50,000 4 minutes
10,000 24 minutes
5,000 48 minutes
500 8 hours
Charge Recovery Times
●Sunny day, outdoors (50,000 lux)
Dead battery n Medium
charge 2 hours
Medium charge n High
charge 26 hours
High charge n Full charge 7 hours
●Sunny day, near a window (10,000 lux)
Dead battery n Medium
charge 9 hours
Medium charge n High
charge 135 hours
High charge n Full charge 36 hours
●Overcast day, near a window (5,000 lux)
Dead battery n Medium
charge 19 hours
Medium charge n High
charge 275 hours
High charge n Full charge 73 hours
●Indoor fluorescent lighting (500 lux)
Dead battery n Medium
charge 243 hours
Medium charge n High
charge -
High charge n Full charge -
Note
●Actual charging time depends on the
charging environment, watch settings,
and other factors.
●Power Saving Function
Leaving the watch in a dark location for about
one hour between the hours of 10 p.m. and 6
a.m. will cause the display to go blank, and the
watch to enter Level 1 power saving. If the
watch is left in this condition for six or seven
days, the watch will enter Level 2 power
saving.
Power Saving Level 1 :
Digital display goes blank to save power.
Power Saving Level 2 :
Digital display goes blank to save power. All
functions are disabled.
Recovering from Power Saving Operation
Use one of the operations below to exit power
saving.
●Press any button.
●Move the watch to a bright location.
●Trigger auto light by angling the watch
towards your face.
Note
●The watch will not enter power saving
in the cases below.
ー
Dive Mode
ー
While in the Stopwatch Mode
ー
While in the Timer Mode
●You can enable or disable Power
Saving.
lConfiguring Power Saving
Function Settings
●Note that the watch also may enter
power saving if its face is blocked from
light by your sleeve while you are
wearing it.
Watch Operation Guide 3521
7

Viewing the Face in the Dark
The watch has a light that illuminates the face
for viewing in the dark.
●To illuminate the face manually
Press (B) to turn on illumination.
●Illumination will turn off automatically if an
alarm starts to sound.
●To illuminate the face when Auto Light
is enabled
If Auto Light is enabled, face illumination will
turn on automatically whenever the watch is
positioned at an angle of 40 degrees or more.
40
degrees
or more
Important!
●Auto Light may not operate properly
when the watch is at a horizontal angle
of 15 degrees or greater from
horizontal as shown in the illustration
below.
●Electro-static charge or magnetism
can interfere with proper auto light
operation. If this happens, try lowering
your arm and then angle it towards
your face again.
●When moving the watch you may note
a slight rattling sound. This is due to
operation of the auto light switch,
which determines the current
orientation of the watch. It does not
indicate malfunction.
●Frequent use of illumination will run
down the battery.
●Certain positions during diving may
interfere with Auto Light operation.
Note
●Auto Light is disabled when any one of
the conditions below exists.
ー
Alarm, timer alert, or other beeper
sounding
●Configuring the Auto Light Setting
1. Enter the Timekeeping Mode.
lNavigating Between Modes
2. Hold down (B) for at least three seconds
to toggle Auto Light between enabled and
disabled.
●[LT] is displayed while Auto Light is
enabled.
Note
●Auto Light is disabled while [CHG] is
shown on the display.
●Specifying the Illumination Duration
You can select either 1.5 seconds or three
seconds as the illumination duration.
1. Enter the Timekeeping Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) 10 times.
[LT] appears on the display with [1] or [3]
flashing.
4. Press (D) to select an illumination
duration.
[LT1]: 1.5-second light
[LT3]: 3-second light
5. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●The illumination duration is fixed as
three seconds in the Dive Mode.
Watch Operation Guide 3521
8

Time Adjustment
Use the procedures in this section to adjust the
date and time settings.
Adjusting the Current Time
Setting
Use the procedures below to adjust the
current date and time settings, and to select a
Home City.
●Setting a Home City
Use the procedure in this section to select a
city to use as your Home City. If you are in an
area that observes summer time, you can also
configure a summer time setting.
1. Enter the Timekeeping Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Use (B) and (D) to change the Home City
setting.
●Holding down (B) or (D) scrolls through
settings at high speed.
●For details refer to the information
below.
lCity Table
4. Press (C).
5. Use (D) to change the summer time
setting.
●[OFF]
The watch always indicates standard
time.
●[ON]
The watch always indicates summer
time.
6. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●Setting the Time/Date
Important!
●Configure the Home City setting before
changing the current time and date
settings.
lSetting a Home City
1. Enter the Timekeeping Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Use (C) to display the setting you want to
change.
●Each press of (C) cycles through
settings in the sequence shown below.
Summer time
Home City
Minutes
Hours
Seconds
Illumination duration
Day
Month
Ye a r
12/24-hour timekeeping
Operation tone enable/disable
Power Saving
Watch Operation Guide 3521
9

4. Configure the date and time settings.
●While the seconds are flashing,
pressing (D) will reset them to 00. 1 is
added to the minutes when the current
seconds count is between 30 and 59
seconds.
●For all the other settings, use (B) and (D)
to change the flashing setting.
Holding down (B) or (D) scrolls through
settings at high speed.
5. Repeat steps 3 and 4 to select time and
date settings.
6. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●Switching between 12-hour and 24-
hour Timekeeping
You can specify either 12-hour format or 24-
hour format for the time display.
1. Enter the Timekeeping Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) twice.
This causes [12H] or [24H] to flash on the
display.
4. Press (D) to select [12H] (12-hour
timekeeping) or [24H] (24-hour
timekeeping).
24-hour timekeeping12-hour timekeeping
5. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
World Time
World Time lets you look up the current time
in any of 48 cities (31 time zones) around the
globe.
Checking World Time
1. Enter the World Time Mode.
lNavigating Between Modes
Entering the World Time Mode displays
the city code of the currently selected
World Time city.
●Each press of (D) scrolls through city
codes.
●To select UTC (Offset: 0) as the city
code, press (B) and (D) at the same
time.
●For information about city codes, see
the information below.
lCity Table
City code
Watch Operation Guide 3521
10

Setting the World Time City
Use the procedure in this section to select a
World Time city. If you are in an area that
observes summer time, you can also
configure a summer time setting.
1. Enter the World Time Mode.
lNavigating Between Modes
2. Press (D) to display the city code of the
currently selected city.
●Holding down (D) scrolls through
settings at high speed.
●To select UTC (Offset: 0) as the city
code, press (B) and (D) at the same
time.
●For information about city codes, see
the information below.
lCity Table
City code
3. If you want to configure the summer time
setting, hold down (A) for at least two
seconds.
[DST] is displayed along with summer
time.
●Each time you hold down (A) for at least
two seconds, the setting toggles
between standard time and summer
time.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●The summer time setting you configure
is applied to the currently selected city
only. It does not affect other cities.
Alarm and Hourly
Time Signal
The watch will beep when the alarm time is
reached. You can configure up to four
standard daily alarms, and one daily alarm
with snooze. The hourly time signal causes the
watch to beep every hour on the hour.
●Snooze causes the alarm to sound up to
seven times, at five-minute intervals.
●The alarm sound is muted in the cases
described below.
ー
When battery power is low
ー
When watch is at Level 2 power saving
lPower Saving Function
Configuring Alarm Settings
1. Enter the Alarm Mode.
lNavigating Between Modes
2. Press (D) to scroll through alarms ([1] to
[4], [SNZ]) until the one you want to
configure is displayed.
Alarm number
Alarm time
3. Hold down (A) for at least two seconds.
This causes the hours digits to flash.
Alarm hour
4. Use (B) and (D) to change the hour setting.
●Holding down (B) or (D) scrolls through
settings at high speed.
●If you are using 12-hour timekeeping,
[P] indicates p.m.
5. Press (C).
This causes the minutes digits to flash.
Alarm minute
6. Use (B) and (D) to set the minute setting.
7. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●Testing the alarm
In the Alarm Mode, hold down (D) to sound the
alarm.
●To stop the alarm
To stop the alarm after it starts to sound when
an alarm time is reached, press any button.
Snooze causes the alarm to sound up to seven
times, at five-minute intervals. To cancel a
snooze alarm, turn [SNZ] off.
lTurning Off an Alarm or the Hourly Time
Signal
Note
●A beeper will sound for 10 seconds to
let you know when the alarm time is
reached.
●The watch will automatically return to
the Timekeeping Mode from the Alarm
Mode after two or three minutes of non-
operation.
Watch Operation Guide 3521
11

Configuring the Hourly Time
Signal Setting
1. Enter the Alarm Mode.
lNavigating Between Modes
2. Use (D) to display the hourly time signal
screen ([SIG]).
3. Press (A) to toggle the hourly time signal
between enabled and disabled.
●[SIG] (hourly time signal) is shown on
the display while the hourly time signal
is enabled.
Turning Off an Alarm or the
Hourly Time Signal
To stop an alarm or the hourly time signal from
sounding, perform the steps below to turn it
off.
●To have an alarm or hourly time signal
sound again, turn it back on.
Note
●Indicators are displayed while any of
the alarms or the hourly time signal is
turned on.
●The applicable indicators are not
displayed while all of the alarms are
turned off and/or the hourly time signal
is turned off.
Alarm
Snooze Hourly time signal
1. Enter the Alarm Mode.
lNavigating Between Modes
2. Press (D) to scroll through alarms ([1] to
[4], [SNZ]) until the one you want to
configure is displayed.
Alarm number or hourly time signal
3. Press (A) to turn off the displayed alarm or
the hourly time signal.
●Each press of (A) toggles between on
and off.
●Turning off all alarms will cause [ALM]
(alarm) to disappear from the display,
while disabling the hourly time signal
causes [SIG] (hourly time signal) to
disappear from the display.
Note
●If [ALM] (alarm) is still displayed, it
means that another alarm is still turned
on. To turn off all of the alarms, repeat
steps 2 and 3 until the [ALM] (alarm)
indicator is no longer displayed.
Using the Dive
Function
You can use the procedures in this section to
measure dive times and surface intervals. The
watch also records dive log data
automatically. There is memory for up to 10
dive log data records. Recording dive log data
when there are already 10 log data records in
memory causes the oldest log record to be
deleted automatically to make room for the
new one.
●You can use diving log data to view the
items below.
ー
Dive start date and time
ー
Dive time
ー
Surface interval
You can use the Log Data Recall Mode to view
recorded dive log data.
lViewing Dive Log Data
Important!
●If the battery is low or dead, charge it
before using the watch for diving.
●Before starting a dive (while still on a
boat or the water’s surface), enter the
Dive Mode.
Watch Operation Guide 3521
12

Measuring Elapsed Dive
Time
Dive time is measured in units of one second
up to 23 hours, 59 minutes, 59 seconds (24
hours).
1. Enter the Dive Mode.
lNavigating Between Modes
2. Press (D).
This starts dive time measurement.
Dive graph
Dive start time
Current time
Dive time (hours, minutes, seconds)
3. Hold down (D) for at least one second to
stop dive time measurement.
This starts surface interval measurement.
4. Press (A) to reset the measurement time
to all zeros.
●Resetting the measurement causes log
data to be recorded.
Note
●The surface interval is not displayed
during measurement. Only the latest
log data record is displayed in the Log
Data Recall Mode.
lViewing Dive Log Data
●After you finish Dive Mode
measurement, holding down (C) for at
least one second to enter the
Timekeeping Mode also reset
measurement up to that point.
●Even if you return to the Timekeeping
Mode while a Dive Mode dive time
measurement operation is in progress,
the watch continues the measurement
operation internally.
●If 11 or 12 hours elapse after the watch
enters the Dive Mode, it automatically
returns to the Timekeeping Mode.
Measuring Surface Interval
Time
This function measures the time since your
last dive as surface interval time, which can be
used in preparation for repetitive diving.
The surface interval time can be measured up
to 48 hours in one-minute increments.
1. Enter the Dive Mode.
lNavigating Between Modes
2. Use the operations below to perform a
timer operation.
D
D
D
D
Surface Interval 1 start
(Hold down at least one second.)
Dive 1 start
Dive 2 start
Surface Interval 2 start
(Hold down at least one second.)
3. To reset the ongoing surface interval
measurement operation, press (A).
●Resetting the measurement causes log
data to be recorded.
Note
●The surface interval is not displayed
during measurement. Only the latest
log data record is displayed in the Log
Data Recall Mode.
lViewing Dive Log Data
●Even if you return to the Timekeeping
Mode while a Dive Mode dive time
measurement operation is in progress,
the watch continues the measurement
operation internally.
●If 11 or 12 hours elapse after the watch
enters the Dive Mode, it automatically
returns to the Timekeeping Mode.
Exiting the Dive Mode
After you finish performing dive time
measurement in the Dive Mode, holding down
(C) for at least one second enters the
Timekeeping Mode.
●Even if you return to the Timekeeping Mode
while a dive time measurement operation is
in progress, the watch continues the
measurement operation internally.
Viewing Dive Log Data
1. Enter the Log Data Recall Mode.
lNavigating Between Modes
This displays the latest log data.
Dive time
Dive start time
Interval time
Log record
number
●The interval time is shown on the latest
log data record only.
●The message [- : - -] appears when there
is no log data.
2. Press (D).
Each press of (D) scrolls back from the
newest log data record.
Dive time
Dive start time
Dive start month and day
Log record number
●Older data records have lower record
numbers.
Watch Operation Guide 3521
13

Note
●There is memory for up to 10 dive log
data records. Recording dive log data
when there are already 10 log data
records in memory causes the oldest
log record to be deleted automatically
to make room for the new one.
●The watch automatically returns to the
Timekeeping Mode from the Log Data
Recall Mode after one or two minutes
of non-operation.
Deleting Dive Log Data
This deletes all log data records. Note that log
data records cannot be deleted individually.
1. Enter the Log Data Recall Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
This deletes the diving log data.
Tide Level and Moon
Age
You can use the procedures in this section to
check the tide level and Moon age in your
currently selected Home Time city.
Important!
●Displayed information is intended for
reference only. Do not use it for
maritime navigation, etc.
●Before looking up a tide level or Moon
age, configure your Home City
settings.
lSetting a Home City
Checking the Current Tide
Level and Moon Phase
The current time’s tide graph and the current
date’s Moon phase (Moon Graph) are
displayed in the modes below.
●Timekeeping Mode
●Tide Graph/Moon Graph Mode
●Dive Mode
Moon Graph
Tide Graph
●Interpreting Tide Graph Information
High tide
Low tide
High tide
Flash simultaneously
Tide Cycle (Three Patterns)
Spring tide Half tide Neap tide
Large
difference
between high
tide and low
tide
Moderate
difference
between high
tide and low
tide
Small
difference
between high
tide and low
tide
●Interpreting the Moon Graph
Shaded part
Moon part (white)
Watch Operation Guide 3521
14

●Interpreting the Moon Graph and Moon
Age Indicator
Moon phase Moon age This
indicator:
New Moon 0.0 to 0.9
28.7 to 29.8
1.0 to 2.7
2.8 to 4.6
4.7 to 6.4
First Quarter 6.5 to 8.3
8.4 to 10.1
10.2 to 12.0
12.1 to 13.8
Full Moon 13.9 to 15.7
15.8 to 17.5
17.6 to 19.4
19.5 to 21.2
Last Quarter 21.3 to 23.1
23.2 to 24.9
25.0 to 26.8
26.9 to 28.6
●The Moon phase shown by the Moon graph
is the approximate shape of the Moon at
noon of the displayed date. It is meant only
to indicate whether the left or right side of
the Moon is shaded. Its shape is different
from the actual phase of the Moon.
●The Moon phases shown in the above table
are for when the Moon is viewed towards
the south with respect to the northern
hemisphere. In the Southern Hemisphere or
near the equator, the light and dark portions
of the Moon are opposite those shown by
the watch’s indicator.
Checking the Tide Level and
Moon Age for a Specific Date
and Time
You can use the procedures in this section to
look up the tide level (Tide Graph) and Moon
age for a date or time you specify.
1. Enter the Tide Graph/Moon Graph Mode.
lNavigating Between Modes
Entering the Tide Graph/Moon Graph
Mode displays a Tide Search or Moon
Search screen.
2. Press (A) to toggle between Tide Search
and Moon Search.
Hour, minute
Month, day
Tide Graph
Moon SearchTide Search
Moon Graph
Moon age
●The initial setting of Tide Search is 6:00
a.m.
●To check the Tide Graph at the top of
each hour of the current day
1. Enter the Tide Graph/Moon Graph Mode.
lNavigating Between Modes
2. Press (A) to display the Tide Search
screen.
3. Use (D) to select the time whose Tide
Graph you want to view.
●Each press of (D) advances the time by
one hour.
●Holding down (D) scrolls through
settings at high speed.
Time
Tide Graph
●To scroll the day and check information
1. Enter the Tide Graph/Moon Graph Mode.
lNavigating Between Modes
2. Press (A) to display the Moon Search
screen.
3. Use (D) to select the day whose Moon age
you want to view.
●Each press of (D) advances by one day.
●Holding down (D) scrolls through
settings at high speed.
Moon age
Month, day
4. Press (A) to display the Tide Search
screen.
5. Use (D) to select the time whose Tide
Graph you want to view.
●Each press of (D) advances the time by
one hour.
●Holding down (D) scrolls through
settings at high speed.
Time
Tide Graph
Month, day
Note
●The watch automatically returns to the
Timekeeping Mode from the Tide
Graph/Moon Graph Mode after two or
three minutes of non-operation.
Watch Operation Guide 3521
15

Adjusting High Tide Times
You can improve the accuracy of the
displayed high tide by adjusting the high tide
time in accordance with information available
on the internet or in a newspaper.
1. Enter the Tide Graph/Moon Graph Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the tide graph
high tide time hour setting starts to flash.
Tide graph high tide time hour
3. Use (C) to select the setting item you want
to change.
●Each press of (C) cycles through setting
items in the sequence shown below.
Lunar observation direction
High tide time minute
High tide time hour
4. Configure the settings.
●Specifying the high tide time
Use (B) and (D) to change the value.
ー
Holding down (B) or (D) scrolls
through settings at high speed.
Note
●To return the high tide time setting to
its initial factory default setting, press
(B) and (D) at the same time.
●For a location where there are two high
tides per day, set the time of the first
high tide. The watch will automatically
calculate the time of the second high
tide.
●The high tide time you set here does
not change even if you turn on daylight
saving time in the Timekeeping Mode.
●Specifying the lunar observation
direction
Use the operation below to select
“Northern Hemisphere Moon phase
(Moon visible towards the south)” or
“Southern Hemisphere Moon phase
(Moon visible towards the north)”.
Use (D) and [ ] to change the
direction.
[N S]: Moon visible towards the
south
[N S]: Moon visible towards the
north
5. Repeat steps 3 and 4 to perform high tide
time calibration.
6. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
Stopwatch
The stopwatch measures elapsed time in units
of 1/100 second up to 23 hours, 59 minutes,
59.99 seconds (24 hours).
When this maximum limit is exceeded,
elapsed time measurement returns to 0 and
timing continues from there.
Measuring Elapsed Time
1. Enter the Stopwatch Mode.
lNavigating Between Modes
Hours
Minutes, seconds, 1/100 seconds
2. Use the operations below to measure
elapsed time.
D
D
D
DStop
Resume
Stop
Start
3. Press (A) to reset the measurement time
to all zeros.
Watch Operation Guide 3521
16

Measuring a Split Time
1. Enter the Stopwatch Mode.
lNavigating Between Modes
Hours
Minutes, seconds, 1/100 seconds
2. Use the operations below to measure
elapsed time.
●Pressing (A) displays the elapsed time
from the start of a race up to the point
when you pressed the button (split
time).
D
A
A
DStop
Split release
Split
Start
3. Press (A) to reset the measurement time
to all zeros.
Timing the First and Second
Place Finishers
1. Enter the Stopwatch Mode.
lNavigating Between Modes
Hours
Minutes, seconds, 1/100 seconds
2. Use the operations below to measure
elapsed time.
D
A
D2nd Finisher*
1st Finisher*
Start
* This displays the time of the first
finisher.
3. Press (A) to display the time of the second
finisher.
4. Press (A) to reset the measurement time
to all zeros.
Timer
The timer counts down from a start time
specified by you. A beeper sounds when the
end of the countdown is reached.
●The beeper is muted when battery power is
low.
Watch Operation Guide 3521
17

Setting the Time
The countdown start time can be set in 1-
minute units up to 24 hours.
●If a timer countdown operation is in
progress, reset the timer to its current start
time before performing this operation.
lUsing the Timer
1. Enter the Timer Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
This causes the hours digits to flash.
Hours
3. Use (B) and (D) to change the timer hours
setting.
●Holding down (B) or (D) scrolls through
settings at high speed.
4. Press (C).
This causes the minutes digits to flash.
Minutes
5. Use (B) and (D) to change the timer
minutes setting.
6. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●Setting a start time of 0:00 performs a
countdown of 24 hours.
Using the Timer
The timer counts down time in 1-second units.
1. Enter the Timer Mode.
lNavigating Between Modes
Hour, minute, second
2. Use the operations below to perform a
timer operation.
D
D
D
(Time up)
Resume
Pause
(Countdown starts)
Start
●A beeper will sound for 10 seconds to
let you know when the end of a
countdown is reached.
●You can reset a paused countdown to
its start time, by pressing (A).
3. Press any button to stop the tone.
Other Settings
This section explains other watch settings you
can configure.
Enabling the Button
Operation Tone
Use the procedure below to enable or disable
the tone that sounds when you press a button.
1. Enter the Timekeeping Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) nine times.
This causes [KEY♪] or [MUTE] to flash on
the display.
4. Press (D) to select [KEY♪] or [MUTE].
[KEY♪]: Operation tone enabled.
[MUTE]: Operation tone disabled.
5. Press (A) to complete the setting
operation.
●[MUTE] is displayed while the operation
tone is muted.
Watch Operation Guide 3521
18

Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●Note that alarm and timer tones will still
sound even while the operation tone is
muted.
Configuring Power Saving
Function Settings
1. Enter the Timekeeping Mode.
lNavigating Between Modes
2. Hold down (A) for at least two seconds.
Release the button when the city code
starts to flash.
City code
3. Press (C) 11 times.
This displays [PS].
4. Press (D) to toggle between on and off.
[On]: Power Saving enabled.
[OFF]: Power Saving disabled.
5. Press (A) to complete the setting
operation.
Note
●While the setting is being configured,
the watch will exit the setting operation
automatically after about two or three
minutes of non-operation.
●For details about Power Saving, refer
to the information below.
lPower Saving Function
Other Information
This section provides non-operational
information you also need to know. Refer to
this information as required.
City Table
City Offset
UTC Coordinated
Universal Time 0
LIS Lisbon
LON London
MAD Madrid
+1
PAR Paris
ROM Rome
BER Berlin
STO Stockholm
ATH Athens
+2CAI Cairo
JRS Jerusalem
MOW Moscow +3
JED Jeddah
THR Tehran +3.5
DXB Dubai +4
KBL Kabul +4.5
KHI Karachi +5
DEL Delhi +5.5
KTM Kathmandu +5.75
DAC Dhaka +6
RGN Yangon +6.5
BKK Bangkok +7
SIN Singapore
+8
HKG Hong Kong
BJS Beijing
TPE Taipei
SEL Seoul +9
TYO Tokyo
ADL Adelaide +9.5
GUM Guam +10
SYD Sydney
NOU Noumea +11
WLG Wellington +12
PPG Pago Pago -11
HNL Honolulu -10
ANC Anchorage -9
YVR Vancouver -8
LAX Los Angeles
YEA Edmonton -7
DEN Denver
MEX Mexico City -6
CHI Chicago
NYC New York -5
SCL Santiago -4
YHZ Halifax
City Offset
YYT St. John’s -3.5
RIO Rio de Janeiro -3
FEN Fernando de
Noronha -2
RAI Praia -1
●The information in the above table is current
as of January 2022.
●Time zones may change and UTC
differentials may become different from
those shown in the table above.
Specifications
Accuracy at normal temperature :
±15 seconds a month
Timekeeping :
Hour, minute, second, month, day, day of
the week
a.m./p.m.(P)/24-hour timekeeping
Full Auto Calendar (2000 to 2099) *
* Year display on setting screen only.
Summer Time
Diving Function :
Dive time
Measuring unit: 1 second
Measurement range: 23 hours, 59
minutes, 59 seconds (24 hours)
Interval time
Measurement unit: 1 minute
Measurement capacity: 47 hours, 59
minutes (48 hours)
10 log memory records (dive start date
and time, dive time, interval time)
Tide Graph/Moon Graph function :
Tide Graph (with tide cycle display)
Moon phase display
Date selection
Time select (Tide Graph only)
World Time :
Current time display for 48 cities (31 time
zones) around the globe
Summer time
Alarm :
Time alarms
Alarms: 5 (with one snooze alarm)
Setting units: Hours, minutes
Alarm tone duration: 10 seconds
Hourly time signal: Beep every hour on the
hour
Watch Operation Guide 3521
19

Stopwatch :
Measuring unit: 1/100 second
Measuring range
23 hours, 59 minutes, 59.99 seconds (24
hours)
Measurement Functions:
Elapsed time, split times, 1st and 2nd
place finisher times
Timer :
Measuring unit: 1 second
Countdown range: 24 hours
Setting unit: 1 minute
Time up: 10-second beeper
Other :
High-brightness LED light (Full Auto Light,
afterglow, 1.5 or 3-second illumination
duration setting), power saving, battery
power indicator, operation tone on/off
Power Supply :
Solar panel and one rechargeable battery
Battery operating time: Approximately 14
months
Conditions:
Not exposed to light under the conditions
below.
●Illumination: 1.5 seconds/day
●Alarm: 10 seconds/day
●Display: 18 hours/day
●Diving Function
ー
Number of dives: 50/year
ー
Dive time: 60 minutes/dive
Note that battery operating time is reduced
by illumination conditions and dive time
duration in the Dive Mode.
Specifications are subject to change without
notice.
Troubleshooting
World Time
Q1 The time for a World Time City is not
correct.
The summer time setting (standard time/
summer time) is wrong.
lSetting the World Time City
Diving Function
Q1 I can’t enter the Dive Mode.
The watch does not enter the Dive Mode while
its charge is low or dead. Charge the watch
before using it for diving.
Q2 The watch enters the Timekeeping
Mode when it switches from dive time
measurement to surface interval
measurement.
If the charge becomes low while in the Dive
Mode, the watch is not able to perform surface
interval measurement. Charge the watch
before using it for diving.
Q3 Measurement is in progress when I
switch from the Timekeeping Mode
to the Dive Mode.
This happens when a previous measurement
is being continued. Enter the Dive Mode and
reset measurement.
lMeasuring Elapsed Dive Time
Tide Level
Q1 There are errors in the tide
information.
Since the high tide and low tide times and tide
levels of the Tide Graph are calculated based
on past data, the calculated data may be
different from actual tide information.
Also note that the degree of the error can be
affected by terrain, weather, and other
conditions. Use the tide information of this
watch for reference only.
Be sure to check accurate tide forecast
information issued by various organizations,
and do not use the tide information of this
watch to determine tide levels used for
navigation or any other purpose where there
is the risk of danger.
Alarm and Hourly Time
Signal
Q1 An alarm does not sound.
Is the watch’s battery charged?
Keep the watch exposed to light until it
recharges sufficiently.
lCharging
Other than the above.
The alarm’s settings may not be
configured. Configure the alarm settings.
lConfiguring Alarm Settings
Q2 The hourly time signal does not
sound.
Is the watch’s battery charged?
Keep the watch exposed to light until it
recharges sufficiently.
lCharging
Other than the above.
The hourly time signal may be disabled.
Enable the hourly time signal.
lConfiguring the Hourly Time Signal
Setting
Watch Operation Guide 3521
20

Charging
Q1 The watch does not work even
though it is exposed to light.
The watch stops operating whenever the
battery goes dead. Keep the watch exposed
to light until it recharges sufficiently.
lChecking the Charge Level
Q2 [H], [M], and [L] are flashing on the
display.
The watch is in the charge recovery mode.
Wait until the recovery process is complete
(about 15 minutes). The watch will recover
more quickly if you place it in a brightly lit
location.
●If an alarm, hourly time signal, illumination
and/or other power-intensive functions are
used within a short period of time, the
charging capacity of the battery will drop
and cause the watch to go into a charge
recovery mode. Function availability will be
temporarily limited, but functionality will
return after the battery recovers.
lChecking the Charge Level
Q3 [CHG] is flashing on the display.
The charge level of the watch is extremely low.
Immediately expose the watch to light to
charge it.
lChecking the Charge Level
Other
Q1 I can’t find the information I need
here.
Visit the website below.
https://world.casio.com/support/
Watch Operation Guide 3521
21