To turn an alarm and the Hourly Time Signal on and off
1. In the Alarm Mode, use D to select an alarm or the Hourly Time Signal.
2. When the alarm or the Hourly Time Signal you want is selected, press A to turn it on and off.
The alarm on indicator (when any alarm is on), snooze alarm
Alarm on indicator
indicator (when the snooze alarm is on), and the Hourly Time
Signal on indicator (when the Hourly Time Signal is on) are shown
on the display in all modes.
Hourly time signal
Checking the Current Time in a Different Time Zone
You can use the World Time Mode to view the current time in one of 31 time zones (48 cities and the UTC
time zone) around the globe. The city that is currently selected in the World Time Mode is called the
"World Time City".
To enter the World Time Mode
Use C to select the World Time Mode (WT) as shown on page E-26.
Word Time City
One second after WT appears on the display, the city code of the
currently selected World Time City will scroll once in the upper display.
After that, the World Time City's city code will be displayed in the upper
To view the time in another time zone
In the World Time Mode, use D to scroll through city codes.
Current time in the currently
selected World Time City
Taking Temperature Readings
Your watch can measure air temperature during normal daily use, and water temperature while diving.
To take temperature readings
Use C to select the Thermometer Mode (TEMP) as shown on page E-26.
TEMP will appear in the upper display and temperature measurement
will start. After about one second, the measurement reading will
appear in the lower display.
The watch will continue to take temperature readings every second for
The watch will return to the Timekeeping Mode after the reading
operation is complete (60 minutes).
Press D to restart temperature readings.
Pressing C while a reading operation is in progress will stop the
operation and enter the Tide/Moon Mode.
Diving (Diving Mode)
Pressing A while under water displays the current water temperature for
about three seconds.
To calibrate the temperature sensor
1. Take a reading with another measurement device to determine the
exact current temperature.
2. With the watch in the Timekeeping Mode, press C to enter the
3. Hold down A for at least two seconds.
SET Hold will ﬂ ash on the display and then the temperature will
ﬂ ash. Keep A depressed until °C ﬂ ashes.
4. Use D (+) and L (−) to calibrate the temperature value with the reading of another instrument.
Each press of a button changes the temperature value in units of 0.1°C (0.2°F).
To return the temperature to its uncalibrated value (OFF setting), press D and L at the same
5. Press A to complete calibration and restart the temperature reading operation.
Air temperature measurements are affected by your body temperature (while you are wearing the watch),
direct sunlight, and moisture. To achieve a more accurate temperature measurement, remove the watch
from your wrist, place it in a well ventilated location out of direct sunlight, and wipe all moisture from the
case. It takes approximately 20 to 30 minutes for the case of the watch to reach the actual surrounding
Water Temperature Measurement Precautions
Your body temperature has almost no effect on water temperature measurements. However, sudden
changes in water temperature can take up to about ﬁ ve minutes to be reﬂ ected in temperature readings
by the watch.
Operation Guide 3445
To stop the alarm
Press any button.
The snooze alarm sounds up to seven times at intervals of about ﬁ ve minutes.
After the snooze alarm ﬁ rst sounds, SNZ will ﬂ ash on the display until the snooze alarm sounds all
seven times or until it is canceled.
The snooze alarm will be canceled when any of the following occurs while the SNZ indicator is ﬂ ashing
on the display.
– If you turn off the snooze alarm
– If you display the snooze alarm setting screen
– If you display the Timekeeping Mode setting screen
– If your Home City and World Time City are the same city, and you use the World Time Mode to
change the summer time setting of your Home City
To test the alarm
In the Alarm Mode, hold down D. The alarm will sound as long as D is depressed.
To specify standard time or daylight saving time (DST) for a city
1. In the World Time Mode, use D to scroll through the available city
Keep scrolling until the city code whose Standard Time/Daylight
Saving Time setting you want to change is displayed.
2. Hold down A for at least two seconds.
Keep A depressed until DST Hold on or DST Hold OFF starts to
ﬂ ash on the display.
DST Hold on means that summer time is enabled, and that the
current time is advanced accordingly. DST Hold OFF means that
summer time is disabled, and that the current time shows standard
This toggles the city code you selected in step 1 between Daylight
Saving Time (DST indicator displayed) and standard time (DST
indicator not displayed).
Using the World Time Mode to change the DST setting of the
city code that is selected as your Home City also will change the
Timekeeping Mode time DST setting.
Note that you cannot switch between standard time/daylight
saving time (DST) while UTC is selected as the World Time City.
Note that the standard time/daylight saving time (DST) setting
affects only the currently selected time zone. Other time zones are
Temperature is displayed in units of 0.1°C (or 0.2°F).
The displayed temperature value changes to - -.- °C (or °F) if a measured temperature falls outside the
range of –10.0°C to 60.0°C (14.0°F to 140.0°F). The temperature value will reappear as soon as the
measured temperature is within the allowable range.
You can select either Celsius (°C) or Fahrenheit (°F) for the displayed temperature value. See "To specify
temperature and water depth display units" (page E-57).
Temperature Sensor Calibration
The temperature sensor built into the watch is calibrated at the factory and normally requires no further
adjustment. If you notice serious errors in the temperature readings produced by the watch, you can
calibrate the sensor to correct the errors.
Incorrectly calibrating the temperature sensor can result in incorrect readings.
Carefully read the following before doing anything.
– Compare the readings produced by the watch with those of another reliable and accurate thermometer.
– If adjustment is required, remove the watch from your wrist and wait for 20 or 30 minutes to give the
temperature of the watch time to stabilize.
Best temperature sensor calibration results are achieved when performed in water with a stable
Checking the Tide Level, Moon Phase, and Moon Age (Tide/Moon)
You can use the watch to check the current tide level, Moon phase, and Moon age.
The above information is displayed for the currently selected Home Time City (page E-30).
Note that the tide and Moon information displayed by this watch is approximate and is intended as
general information only. Never try to use it for marine navigation or any other purposes requiring
To view the current tide level
In the Timekeeping Mode, press A to display the Tide Graph.
Tide level (Tide Graph)