Citizen U10 User manual

2 3
CONTENTS
Safety Precautions: Observe at All Times
....... 6
- General Diving Precautions - ........................... 8
- Precautions Relating to Use of this Watch - ... 9
Introduction ..................................................... 13
Expose the Watch to Light Before Using
... 14
Features ............................................................ 15
Names of Components ................................ 18
[Digital Display] .................................................. 19
Charge Level Indicator and Continuous
Operating Times ............................................. 20
1. Reading the Charge Level Indicator ............ 21
2. General Reference for Charging Times ....... 22
3. Continuous Operating Time ......................... 22
Unique Functions of Solar-Powered
Watches ............................................................ 24
[Insufficient Charge Warning Function] .......... 26
[Overcharge Prevention Function] ................... 26
[Power Save 1 Function] .................................. 27
[Power Save 2 Function] .................................. 28
Watch Display Modes (Functions) ............ 29
[Standard Mode] ................................................ 29
1. Time/Date Mode ......................................... 29
2. Surface Mode ............................................. 29
3. Travel Time Mode ...................................... 29
4. Alarm 1, 2 and 3 Modes ............................ 29
5. Dive Alarm Setting Mode .......................... 29
6. Diving Log Recall Mode ............................ 29
7. Reference Position Check Mode .............. 29
English English English English English English English
[Diving Mode] ..................................................... 30
1. Diving Ready 1 Status ............................... 30
2. Diving Ready 2 Status ............................... 30
3. Water Depth Measurement Status ........... 31
4. When Having Returned to a Shallow ............
Depth of within 1 m (4 ft) After Diving ..... 31
Switching the Mode ....................................... 32
Using the Standard Mode ............................ 34
1. Using the Time/Date Mode ............................ 34
A. Setting the Time and Date ........................ 34
2. Using the Surface Mode ................................ 37
3. Using the Travel Time Mode ......................... 39
A. Setting Travel Time ................................... 39
B. Switching Between Travel Time and
Time/Date Modes ...................................... 41
4. Using the Alarm Mode ................................... 43
A. Setting the Alarm ...................................... 44
Displayed Cities ............................................. 46
Precautions During Diving .......................... 48
Using the Watch when Diving .......................... 48
Prohibited Matters When Using During Diving
... 50
Precautions Before Diving ................................ 51
Precautions During Diving ................................ 52
Precautions After Diving ................................... 53
Diving Terms ................................................... 54
1. Diving .............................................................. 54
2. Measurement of Water Depth ....................... 55
3. Measurement of Dive Time ........................... 56
4. Measurement of Water Temperature ........... 57
5. Recording of Log Data .................................. 57
6. Termination of the Diving Mode ................... 57
Dive Alarm Functions ................................... 58
1.
Main Types of Dive Alarms and Situations in ............
which Main Dive Alarm Function are Activated
... 59

4 5
2. Explanation of Dive Alarm Functions .......... 60
<Digital Display Error> .................................. 60
When a Digital Display Error Occurs While
Diving: ............................................................ 61
<Water Sensor Error> ................................... 62
<Pressure Sensor Error> .............................. 62
When a Pressure Sensor Error Occurs While
Diving: ............................................................ 62
<Measurement Error (0 m/0 ft Detection)>
..... 63
[Canceling Abnormal Measured Value] ....... 63
<Diving Log Memory Error> ......................... 64
<Charge Alarm> ............................................. 65
When Low Charge is Displayed during ............
Diving: ............................................................ 65
When the Insufficient Charge Alarm is
Displayed While Diving: ................................ 66
<Depth Measurement Error> ........................ 67
<Depth Measurement Out of Range Alarm>
... 67
[Canceling Depth Measurement Out of ............
Range Alarm] ................................................. 67
<Ascent Rate Alarm> .................................... 68
[Canceling the Ascent Rate Alarm] .............. 68
<Depth Alarm> ............................................... 68
[Canceling the Depth Alarm] ........................ 68
<Dive Time Alarm> ........................................ 68
Using the Diving Mode ................................. 69
1. Using the Dive Alarm Setting Mode ............. 69
A. Normal Display in Dive Alarm Setting Mode
.... 69
B. Setting Dive Alarms .................................. 70
2. Switching to the Diving Mode ....................... 72
[When the Watch is Switched to the Diving
Mode] .............................................................. 72
[The display changes in the following ..............
manner according to dive status] ................ 73
Using the Diving Log Recall Mode ........... 75
A. Log Data Display Range ............................... 76
B. Recalling Log Data ........................................ 77
C. Log Number ................................................... 78
D. Deleting Log Data .......................................... 78
E. Regardig Log Data ........................................ 79
Reference Position Check Mode ............... 80
A. Checking the Reference Position ................ 80
Troubleshooting ............................................. 82
Meanings of Frequently Displayed Mode
Marks and Digital Display ............................ 86
[Mode Marks] ...................................................... 86
[Digital Display] .................................................. 87
All-Reset ........................................................... 90
[Procedure] ......................................................... 90
Using EL light .................................................. 92
Models Provided with an Extension Band
..... 92
Handling Precautions (for the watch) ...... 93
Water Resistance Performance ........................ 93
Handling of Energy Storage Cell ...................... 94
Only Use Specified Energy Storage Cell ......... 95
Repairs ................................................................ 95
Keep your watch clean ...................................... 95
<Cleaning the Watch> ....................................... 96
Precautions When Wearing the Watch ............ 96
Handling of the Band (Cautions when Putting ....
on and Taking Off the Watch) ........................... 96
<Temperatures> ............................................ 96
<Static Electricity> ........................................ 97
<Shocks> ....................................................... 97
<Chemical Agents, Gases and Mercury> .... 97
<Storage> ....................................................... 97
Specifications ................................................. 98

6 7
Safety Precautions: Observe at
All Times
The following provides an explanation of those matters
that should be observed at all times to prevent injury
to the wearer or other persons as well as damage to
property before they occur.
■The degree of injury or damage resulting from
incorrect use while ignoring the indicated matters is
classified and explained using the following
markings.
DANGER
This marking indicates matters for which there is a
high risk of death or serious injury.
WARNING
This marking indicates matters for which there is the
risk of death or serious injury.
CAUTION
This marking indicates matters for which there is the
risk of minor injury or property damage.
■The types of matters to be observed are classified
and explained using the following mark (the
following indicates two examples of icons).
This mark indicates that caution or attention is
required.
This mark indicates prohibited matters.
DANGER
Please read this user's manual carefully to make sure
you have a thorough understanding of the handling and
operating procedures, displays and limitations of this
watch and ensure its proper use. Improper use of this
watch or failure to observe displayed warnings,
cautions and instructions can result in the risk of a fatal
or serious accident.
CAUTION
Diving is a potentially dangerous sport. When
using this watch for diving, make sure you have a
proper understanding of the procedures for
handling the watch as described in this manual and
observe proper procedures. Handling of this watch
in a manner contrary to that described in this user's
manual may prevent the watch from functioning
properly.
Request to Customers
All repairs performed on this watch, excluding repairs
involving the band, are to be performed at the
CITIZEN. When desiring to have your watch repaired
or inspected, place contact the Citizen Service Center
either directly or through the store where you
purchased your watch.

8 9
- General Diving Precautions -
WARNING
• In the case of using this watch for diving, always
make sure to receiving the proper diving training
from a licensed instructor to acquire the
experience and skills required for safe diving.
• Make sure you have completely mastered the
handling and operation of this watch. Even
recreational diving can be potentially dangerous.
Diving without the proper or adequate training can
lead to a fatal or serious accident.
WARNING
Each diver should take responsibility for planning
and executing his or her own diving plan to ensure
safe diving. This watch is not equipped with a
function that prevents decompression sickness. In
addition, this watch is also unable to check differences
in physiological functions of individual divers or
differences in physical condition on that day. Since the
occurrence of decompression sickness is greatly
affected by physical condition, the degree of the risk of
decompression sickness varies depending on your
physical condition on that day. It is recommended to
avoid diving whenever you are in poor physical
condition such as when you are ill, fatigued, have not
had enough sleep or have a hangover.
- Precautions Relating to Use of this
Watch -
DANGER
• This watch is not equipped with a function that
indicates decompression diving. Do not engage in
decompression diving while using this watch.
• This watch is not compatible with Nitrox diving.
Never use this watch for Nitrox diving.
DANGER
Do not lend the watch or share the watch with
another person while resting on the surface (during
operation of the surface mode). In addition, the data
displayed on the watch should never be used as the
data for another diver. This watch is designed on the
premise of personal use. Since data accumulated
during the previous time is continued to be used while
in the surface mode, the use of the watch by another
person will prevent data from being calculated that is
suitable for that person and can lead to the risk of a
fatal or serious accident.
DANGER
Avoid flying in an airplane when the surface mode
is operating. Flying in an airplane without allowing
an adequate amount of time for resting following
diving can result in the risk of decompression sickness.
It is recommended to avoid flying for at least 24 hours
following the completion of diving whenever possible.
There is no method for completely preventing
decompression sickness caused by flying in an airplane
after diving.

10 11
WARNING
In the case of using this watch for diving, always
make sure to use the watch in combination with
other diving instruments (dive table, divers' watch,
residual pressure gauge or water depth gauge).
Sudden atmospheric fluctuations and changes in water
temperature may have an effect on the display and
performance of the watch. In addition, always make
sure to use the watch in combination with other diving
instruments in case the watch should happen to
malfunction.
WARNING
Always make sure to inspect all functions of the
watch before each dive to prevent malfunctions and
accidents caused by the use of improper settings. In
particular, make sure to check whether the watch is
sufficiently charged and that there are no warnings
displayed on the display.
WARNING
The use of this watch for diving is limited to
recreational diving (non-decompression diving) at a
water temperature of 0˚C to +40˚C (32˚F to 104˚F).
Do not use this watch for the following types of diving:
• Diving outside the above temperature range
• Decompression diving
• Saturation diving using helium gas
• High-altitude diving at 3,000 m (10,000 ft) above
sea level or higher
• Diving in water other than saltwater (water having a
specific gravity of 1.025)
WARNING
Allow a sufficient margin during diving with respect
to the no-decompression diving limit time.

12 13
WARNING
In the case you happen to engage in decompression
diving, immediately begin ascending to the surface
while observing an ascent rate of no more than 9 m
(30 ft)/minute according to a dive table.
WARNING
Do not engage in skin diving after scuba diving
since this can have a serious effect on your health.
This watch does not incorporate a function for
distinguishing between scuba diving and skin diving.
CAUTION
Storage of Log Data
Always make sure to keep a separate record of your
important log data.
Various types of data stored by this watch may be lost
in the following cases:
(1) improper use of the watch
(2) improper usage environment (where subjected to
the effects of strong static electricity or electrical
noise)
(3) during malfunctions and repairs.
Introduction
Thank you for your purchase of this Citizen AQUALAND
Eco-Drive watch. Please make sure to read this manual
carefully before using your watch to ensure that it is used
properly. Furthermore, store this manual in a safe place
for future reference as necessary.
1. This watch is a combination divers watch equipped
with a built-in water depth gauge.
(1) This watch is equipped with a water sensor that
automatically switches the watch to the diving
mode when water is detected.
(2) The following parameters are displayed during
diving:
• Current depth, current time, current water
temperature, dive time and maximum depth are
displayed on Digital Display.
• Elapsed dive time is indicated with the minute
hand.
• Maximum depth is indicated with the function
hand.
(3) The following can be performed after diving:
• Log data recorded during diving (including log
number, dive date, maximum depth, minimum
water temperature and dive time) can be recalled.
2. This watch is also a solar-powered watch provided
with a photoelectric power generation (Eco-Drive)
function.

15
Features
This watch is provided with various convenient
functions for diving.
1. Measurement begins automatically and parameters
including depth, water temperature, dive time and
maximum depth are displayed on the digital display
simply by putting on the watch and entering the water.
2. Various warning functions are provided for safe diving.
(1) A depth alarm sounds and the LED flashes when
the set depth has been exceeded, and a dive time
alarm sounds along with the LED flashing when
the set dive time has been exceeded.
(2) An ascent warning “SLOW” is displayed on the
digital display in the case of a rapid ascent.
3. Up to 20 sets of diving log data are automatically
stored in memory.
This watch is provided with a convenient Eco-
Drive function.
1. This watch is a solar-powered watch that contains a
solar cell in its face that drives the watch by
converting light energy into electrical energy.
2. Once fully charged, the watch will continue to run for
about six months.
• The continuous operating time varies according to
the frequencies at which the alarm, EL light and
diving functions are used.
3. An environmentally-friendly secondary battery that is
completely free of mercury and other harmful
substances is used for the power supply of this watch.
4. This watch is also equipped with the functions
described below.
Charge Level Indicator Function: A general
indication of the charge level of the secondary battery
is displayed with the function hand to one of six levels.
Insufficient Charge Warning Function: The second
hand begins to move at two-second intervals and
[ : Insufficient charge mark] is displayed on the
digital display to indicate that the watch is
insufficiently charged.
14
Expose the Watch to Light
Before Using
Sufficiently charge the watch by exposing it to sunlight
or other light before using until the function hand
indicates level 5.
• Charge the watch by allowing light to shine on the solar
cell (watch face) by referring to "2. General Reference
for Charging Times" for information on the charge level
indicator and continuous operating times.
• When charging with a fluorescent lamp or incandescent
light bulb, be careful not to allow the watch to reach a
high temperature by placing too close to the light source.
If the watch is exposed to a high temperature of 60˚C
(140˚F) or higher, the digital display will turn white and
no longer be displayed. It will return to normal when the
watch is returned to normal temperature.
Function hand
Charge level - "Level 5"

16 17
Power Save 1: The second hand stops at the 12:00
position to save on power.
Power Save 2: The hour hand, minute hand and
second hand stop at the 12:00 position to further save
on power.
Overcharge Prevention Function: The overcharge
prevention function is activated to prevent the watch
from being charged further when the secondary battery
becomes fully charged.
Other Convenient Functions
1. Travel Time Function: This function lets you easily
display the local time when traveling overseas or
traveling on business. In addition, daylight savings
time can be set for each city.
2. Alarm: This watch is equipped with three alarm
modes. (The alarm tones are different.)
3. EL light Function: An EL light function is provided
to make it easier to see the display in dark locations.
4. Wide Digital Display: An easily legible, dot matrix
display having a wide angle of view is used.

18 19
Names of Components
The illustrations shown in this manual may differ from the actual
watch you have purchased.
[Digital Display]
• A dot matrix display using a nematic liquid
crystal is used for the digital display.
•This nematic liquid crystal automatically
scrolls the digital display from top to
bottom when displaying a mode or when
making corrections. Although the display
may appear to flicker while scrolling, this
is not a malfunction. Furthermore, the
timing of display scrolling differs
according to the mode and correction state.
• The display is no longer displayed when
the temperature of the watch reaches 60˚C
(140˚F) or higher. It returns when the
watch temperature returns to normal
temperature.
Hour hand
Button (C)
Depth display
Pressure
sensor
Charge level
indicator
Button (D)
Function hand
Second hand
Button (A)
Water
sensor
Button (B)
Minute hand
LED
Digital display
Day
Month/date
Daylight
savings time
City name

2120
Charge Level Indicator and
Continuous Operating Times
The charge level indicator (reference value) lets you confirm
the extent to which the secondary battery is charged with the
function hand. The charge level indicator is divided into six
levels. The level indicated by the function hand is the
current charge level of the secondary battery.
Try to keep the watch charged to level 5 at all times.
1. Reading the Charge Level Indicator
The charge level of the secondary battery changes
according to the conditions of use, the passage of time and
the manner in which the watch is recharged.
• The charge level of the secondary battery (reference value) and
changes in the charge level indicator are represented
schematically in the illustrations. The design may differ
somewhat depending on the model.
•The water sensor is not activated and the watch cannot be
used for diving due to the watch being insufficiently charged.
• The watch cannot be used in the standard mode.
• The insufficient charge mark is displayed on the digital display
when the charge level falls to level 1 during depth
measurement.
• The EL light is not illuminated.
• The charge level remaining in the secondary battery is low.
• The watch can be used for about 1 hour of diving.
• The EL light is not illuminated.
• All functions can be operated.
Level
Level 0
Level 1
Level 2
Level 3
Level 4
Level 5
Approx. 2 days
Approx. 4 days
Approx. 7 days
Approx 2 months
Approx. 4 months
Approx. 6 months
Charge level
indicator
Continuous operating
time (reference) Description of watch operation at indicated charge level
• Watch is insufficiently charged. It cannot be used for
diving. Promptly recharge the watch.
• "Charge" is displayed and the second hand moves at 2-second
intervals.
• Measurement of water depth is interrupted if the charge level
indicator falls to level 0 (log data is not stored in memory).
• The watch cannot be switched to other modes such as the
travel time and alarm modes.
• The EL light is not illuminated.
Secondary Battery Charge Levels

2322
2. General Reference for Charging
Times
The time required for charging varies according to the
model of the watch (color of the dial, etc.). The following
times are shown below to serve only as a reference.
• Try to recharge the watch before it becomes insufficiently
charged. There is no risk of overcharging the watch no matter
how frequently it is charged (overcharge prevention function).
It is recommended to try to recharge the watch daily.
3. Continuous Operating Time
This watch will continue to run for about six months when
fully charged.
[NOTE]
• The continuous operating time of this watch becomes
shorter the more often the diving mode, dive alarms, EL
light and other functions of this watch are used.
• Allowing the watch to become wet other than when
diving causes activation of the water sensor resulting in a
shortened continuous operating time.
Illuminance
(lx)
Environment
Inside an ordinary office
60-70 cm (24-28 in) under a fluorescent lamp
(30 W)
20 cm (8 in) under a fluorescent lamp (30 W)
Outdoors, cloudy weather
Outdoors, summer, under direct sunlight
500
1,000
3,000
10,000
100,000
Charging time
Charging time to
fully charged from
stopped state
Charging time until
hour hand begins
to move from
stopped state
Approx. charging
time required for
1 day of operation
Approx. 3.5 hours
Approx. 2 hours
Approx. 35 minutes
Approx. 10 minutes
Approx. 2 minutes
Approx. 30 hours
Approx. 15 hours
Approx. 6 hours
Approx. 2 hours
Approx. 45 minutes
----
----
Approx. 150 hours
Approx. 45 hours
Approx. 9.5 hours

24 25
Unique Functions of
Solar-Powered Watches
When the watch has become insufficiently charged, it
changes from the normal hand display to the insufficient
charge warning display (the second hand moves at 2-
second intervals and "Charge" is displayed on the digital
display). Recharge the watch by exposing it to light while
referring to "2. General Reference for Charging Times"
until the function hand indicates level 5.
[Normal Hand Display]
When the watch becomes
insufficiently charged as a
result of not being exposed
to light
When the watch is charged
by exposing to light
If the watch is
continued to
be used
without
charging
2 seconds
2 seconds
Second hand moves at
2-second intervals
Second
hand stops
at 0 seconds
position
Charge the watch by exposing to light until the
function hand indicates a charge level 5. Use
the watch after first resetting the time and date.
[Insufficient Charge
Warning Display]
[Stopped]

26 27
[Insufficient Charge Warning Function]
When the watch becomes insufficiently charged, the
second hand changes from 1-second interval movement
to 2-second interval movement. The battery mark and
"Charge" are also displayed on the digital display.
If the watch is continued to be used while insufficiently
charged, it stops running after about 2 days. Promptly
expose the watch to light and recharge it to level 5.
<The functions of the watch are limited in the
following manner when the watch becomes
insufficiently charged.>
• Water sensor is not activated and the watch cannot be
used for diving.
• The mode cannot be changed and corrections and
settings cannot be made even if the buttons are pressed.
• The alarm does not sound.
• The EL light is not illuminated.
[Overcharge Prevention Function]
The overcharge prevention function is activated
automatically when the watch face (solar cell) is
exposed to light and the secondary battery is fully
charged to prevent the battery from being charged
further. The secondary battery and accuracy, functions
and performance of the watch are unaffected no matter
how much the watch is charged.
[Power Save 1 Function] ··· The second hand stops
at the 0 seconds position when the Power Save 1
function is activated.
When power is not generated as a result of the watch not
being exposed to light for two consecutive hours when in
the standard mode, the second hand stops at the 0 seconds
position and the watch automatically enters the power
save mode to reduce power consumption.
<The hands and digital display appear as described
below.>
• Second hand: Stops at the 0 seconds position.
• Hour and minute hands: Continue to keep the current
time.
• Function hand: Indicates the charge level.
• Digital display: Displays the city name and date.
• The alarm sounds at the set alarm time.
Canceling Power Save 1:
• Power save 1 is canceled either when the solar cell is
exposed to light and the watch begins to generate power
or a button is pressed switch the watch on.
• Power save 1 is also canceled when the water sensor is
activated and the watch is switched to the diving mode.
When power save 1 has been canceled, the second hand
rapidly advances to the current time (seconds) and begins
1-second interval movement.
<when insufficiently charged>
<Second hand stops at 0 seconds
position>
2 seconds
2 seconds

28 29
[Power Save 2 Function] ··· The hour and minute
hands stop at the 12:00 position when power save 2 is
activated.
If the watch remains in the power save 1 mode for 7
days, it switches to the power save 2 mode to further
reduce power consumption.
<The hands and digital display appear as described
below.>
• Second hand: Stops at the 0 seconds position.
• Hour and minute hands: Stop at the 12:00 position.
• Function hand: Indicates the charge level when the
watch entered the power save 2 mode.
• Digital display: The entire display goes out.
Canceling Power Save 2:
• Power save 2 is canceled either when the solar cell is
exposed to light and the watch begins to generate power.
It cannot be canceled by pressing one of the buttons. In
addition, it is also not canceled when the water sensor
contacts water.
When power save 2 has been canceled, each hand rapidly
advances to the current time (seconds) and begins to keep
time. The digital display returns to the display of the city
name and date.
Watch Display Modes
(Functions)
[Standard Mode]
The watch is normally used in this mode. The standard
mode contains the modes indicated below.
1. Time/Date Mode
• The hands indicate the time while the digital display
displays the city name and date.
2. Surface Mode
• This displays the elapsed time from completion of the
most recent dive (up to 24 hours).
• The surface mode is not displayed after measuring for 24
hours.
3. Travel Time Mode
• The time and date are displayed for a city different from
that of the time/date mode.
4. Alarm 1, 2 and 3 Modes
• The set time and city name are displayed for each alarm.
5. Dive Alarm Setting Mode
• This can be used to set depth and dive time.
6. Diving Log Recall Mode
• This mode is used to confirm log data automatically
recorded during the diving mode.
7. Reference Position Check Mode
• This indicates the reference positions of the watch hands.
<Hour and minute hands stop at the
12:00 position along with the second
hand>

30 31
[Diving Mode]
When the water sensor detects water, the watch
automatically switches to the Diving Ready “READY
Display”. This mode changes in the manner described
below depending on the diving status. However, the
watch will not switch to the diving mode when it is
insufficiently charged.
1. Diving Ready 1 Status
• "READY" and "ready" are alternately displayed on the
digital display.
• Each hand continues to indicate the mode prior to
entering Diving Ready 1.
Example: The current time is displayed during the
display of time and date.
In addition, when the water sensor is switched off and
Diving Ready 1 is canceled, the watch returns to the
mode prior to entering Diving Ready 1.
2. Diving Ready 2 Status
• The watch changes to the Diving Ready 2 Status when
the water depth remains below 50 cm (2 ft) while in
Diving Ready 1 Status.
• Digital display: Alternately displays the "Current time"
and "READY".
• Hour and minute hands: Move to the 12:00 position and
stop.
• Second hand: Indicates the current time (seconds).
• Function hand: Moves to the 0 position on the depth
scale and stops.
3. Water Depth Measurement Status
• The current time, depth, water temperature and dive time
are displayed on the digital display.
• Hour hand: Stops at 6:00 to indicate that measurement of
water depth is in progress.
• Minute hand: Indicates the elapsed dive time (minutes).
(It continues to indicate the elapsed time even after
measuring for 60 minutes.)
• Second hand: Indicates the current time (seconds).
• Function hand: Indicates the most recent depth.
The location where "current depth" or "maximum
depth" is displayed switches automatically when the
position of the minute hand is between 15 and 30
minutes.
4. When Having Returned to a Shallow Depth of
within 1 m (4 ft) After Diving
• The watch remains in the water depth measurement
status (the displayed depth is 0 m).
• The watch switches to the surface mode when the 0 m
(0 ft) display continues for 10 minutes or more after
diving or when button (D) is pressed while 0 m (0 ft) is
displayed.
Current depth
<when having returned to a
shallow depth of within 1 m (4 ft)>
Current depth
<When minute hand indicates
a time other than between 15
and 30 minutes>
<When minute hand indicates
between 15 and 30 minutes>
Current depth

32 33
Switching the Mode
• The watch mode switches in the order of the Time/Date,
Surface, Travel Time, Alarm 1, Alarm 2, Alarm 3, Dive
Alarm Setting, Diving Log Recall and Reference
Position Check modes each time button (D) is pressed.
• When the water sensor detects water, the watch
automatically switches to "Diving Ready 1 Status" of the
Diving Mode.
[Button Operations]
• The mode cannot be changed by pressing a button
while the mode is changing or while the hands are
moving when making a correction. Press the desired
button after waiting until the hands have stopped at
their predetermined positions.
[NOTE]
• The surface mode is not displayed after measuring for 24 hours.
• The watch automatically returns to the time/date mode from
any mode when none of the buttons have been pressed for
about 1 minute in a mode other than the time/date mode.
• The watch automatically returns to the time/date mode from
the reference position check mode when none of the buttons
have been pressed for about 10 minutes.
• The watch will not change to the diving mode even if the
water sensor becomes wet while " : Insufficiently
charged" or " : error mark" is lit and a warning function
has been activated.
Be careful not to touch the water sensor when switching
the mode. The mode will not be able to be switched if the
watch has entered the diving mode after having touched the
water sensor before switching the mode. If the watch has
entered the diving mode, wait until the watch returns to the
time/date mode.
[Standard Mode]
<Time/Date>
(D)
Water sensor
<Surface>
<Diving Ready 1> <Diving Ready 2>
When water
sensor has
detected water
When water sensor
has been switched off
When water depth exceeds
1 m (4 ft)
When water
depth exceeds
50 cm (2 ft)
<Water depth
measurement>
<When the watch has
returned to a water depth
of 0 m (0 ft) after diving> <Surface>
When 0 m (0 ft)
display has
continued for 10
minutes or more or
button (D) is pressed
while 0 m (0 ft) is
displayed
<Travel Time> <Alarm 1> <Alarm 2> <Alarm 3>
<Dive Alarm
Setting>
<Diving Log
Recall>
<Reference
Position Check>
(D) (D) (D) (D) (D)
(D) (D) (D)
(D)
[Diving Mode]

34 35
Using the Standard Mode
1. Using the Time/Date Mode
This mode indicates the time with the hands and displays
the date on the digital display. The function hand
indicates the charge level of the secondary battery.
A. Setting the Time and Date
• Analog time cannot be corrected independently. The
analog time is corrected automatically when the
digital time is corrected.
(1) The watch enters the correction state when button (C)
is pressed for about 2 seconds in the time/date mode.
• Digital display: Changes to "seconds" and flashes.
• Hour, minute and second hands: Move to 12:00 and
stop.
• If the second hand does not stop at the 12:00
position, press button (B) to set it to 12:00. The
second hand moves 1 second when button (B) is
pressed. Continuously depressing button (B) causes
the second hand to move continuously.
(2) The flashing location on the display changes in the
order shown below each time button (C) is pressed.
(3) Correct the flashing location by pressing button (B) or
button (A).
• The display moves forward by one each time button
(B) is pressed.
• The display moves back by one each time button (A)
is pressed.
• Depressing either button continuously causes the
display to advance rapidly.
(4) The watch returns directly to the normal display when
button (D) is pressed in the correction state.
<Normal Display>
<Seconds> <City name>
<Daylight
savings time
switching> <Hours> <Minutes>
<Year> <Date> <Month>
<12/24 H
switching>
(C)
((C)) (C) (C) (C) (C)
(C)(C) (C) (C)
(C) (B)
(D) (A)
((C)) : Press button (C) for about 2 seconds.
(C) : Press button (C) once.

36 37
• The display returns to “0 seconds” when button (A) is
pressed while correcting the “digital seconds”. The
second hand moves when button (B) is pressed.
Always make sure to correct the “digital seconds”
with button (A).
• Refer to "Displayed Cities" for information on city
names.
• The display for daylight savings time and 12/24 H
clock change whenever button (A) or button (B) is
pressed.
• When daylight savings time has been set, the time is
advanced by 1 hour from the current time and "S" is
displayed on the display.
• The daylight savings time cannot be set for UTC
(Coordinated Universal Time).
• The month is displayed using three letters (JAN,
FEB, . . . DEC) when correcting, and displayed using
numbers (1, 2, . . . 12) when the watch is returned to
the normal display.
• The year is displayed and can be set from 2000 to
2099.
• The day is corrected automatically by correcting the
year, month and date.
• Pay attention to AM (a) and PM (p) when the watch
has been set to a 12 H clock display.
• The watch automatically returns to the normal display
when none of the buttons have been pressed for about
1 minute in the correction state (flashing display).
2. Using the Surface Mode
The surface mode displays the elapsed time from
completion of the most recent dive (surface rest time).
This mode measures the elapsed time for up to 24 hours
and is no longer displayed after measurement has been
completed.
WARNING
• Avoid flying in an airplane while the surface mode
is operating.
Flying in an airplane without allowing an adequate
time for resting following diving can result in the risk
of decompression sickness. There is no method for
completely preventing decompression sickness caused
by flying in an airplane after diving.
[Surface Mode]
• Digital display: Display 1: Displays surface time and
maximum depth.
Display 2: Displays surface time and
dive time.
• Hour, minute and second hands: Indicate the time in
the time/date mode.
• Function hand: Indicates the charge level.
<Display 1>
Maximum
depth
<Display 2>
Surface
time
Dive time
Surface Mode
• The display can be switched by
pressing button (C).
(C)
(C)
(C)

38 39
[The surface mark is displayed in the time/date
mode while the surface mode is operating.]
[NOTE]
• When the measured time reaches 24 hours 00 minutes
while the surface mode is displayed, the surface mode
ends and the time/date mode is displayed. The surface
mode is longer displayed after this time.
3. Using the Travel Time Mode
This mode is used to display the time and date of a
selected city by selecting a city name from UTC and 42
cities registered in this watch.
• Digital display: Displays the name of the selected city
and the time and date in that city.
• Hour, minute and second hands: Indicate the time in the
time/date mode.
• Function hand: Indicates the charge level.
A. Setting Travel Time
(1) A city name flashes when button (C) is pressed for
about 2 seconds in the travel time mode.
• The hour and minute hands move to 12:00 and stop.
(2) Switch the city name by pressing button (A) or button
(B).
• City names are recalled moving in the direction in
which the time difference increases when button (B)
is pressed. City names are recalled moving in the
direction in which the time difference decreases
when button (A) is pressed.
• The city name can be switched continuously by
depressing either button continuously.
• Refer to "Displayed Cities" for information on cities
displayed by this watch.
(3) The watch enters the daylight savings time correction
state when button (C) is pressed.
• The "S" mark (daylight savings time set) or "■"
mark (daylight savings time canceled) flash.
(4) Correct by pressing button (A) or button (B).
• The "S" and "■" marks change back and forth each
time a button is pressed.
(5) The watch returns directly to the normal travel time
display when button (D) is pressed while in the
correction state.
<Time/date display>
Surface mark

40 41
• The setting for the 12/24 H clock is the same as that
set in the time/date mode.
• When daylight savings time has been switched in the
travel time mode, it is also applied to the same city in
the time/date mode and alarm mode.
• Daylight savings time cannot be set for UTC
(Coordinated Universal Time).
• The watch automatically returns to the normal travel
time display when none of the buttons have been
pressed for about 1 minute in the correction state.
• The watch automatically returns to the time/date
mode from any mode when none of the buttons have
been pressed for about 1 minute while in the travel
time mode.
B. Switching Between Travel Time and
Time/Date Modes
City names and times displayed in the travel time mode
can be easily switched with city names and times
displayed in the time/date mode.
• The time and date for a frequently traveled city displayed
in the travel time mode can be displayed directly in the
time/date mode by setting that city in the travel time
mode and then switching to that city when traveling.
• The time and date in the city displayed in the time/date
mode are transferred to the travel time mode.
<Travel Time> <Setting a city name>
<Switching between
daylight savings time
on and off>
((C))
(C)
(C)
(C) (B)
(A)(D)