Radio-controlled Atomic Timekeeping Precautions
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Strong electrostatic charge can result in the wrong time setting.
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Even if a receive operation is successful, certain conditions can cause the time setting to be off by up
to one second.
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The watch is designed to update the date and day of the week automatically for the period January 1,
2000 to December 31, 2099. Updating of the date by signal reception will no longer be performed
starting from January 1, 2100.
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If you are in an area where signal reception is not possible, the watch keeps time with the precision
noted in "Specifi cations".
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The receive operation is disabled under any of the following conditions.
– While power is at Level 3 (L) or lower
– While the watch is in the power recovery mode
– While a sensor operation is being performed
– When the watch is in the function sleep state ("Power Saving")
– While a countdown timer operation is in progress
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A receive operation is cancelled if an alarm sounds while it is being performed.
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The Home City setting reverts to the initial default of TYO (Tokyo) whenever the battery power level
drops to Level 5 or when you have the rechargeable battery replaced. If this happens, change the
Home City to the setting you want.
Selecting a Mode
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The illustration below shows which buttons you need to press to navigate between modes.
For about one second after you enter a mode by pressing D, a pointer will appear on the display
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pointing the applicable mode name on the watch's bezel.
In any mode, press L to illuminate the display.
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World Time
World Time
Data Recall
Data Recall
Mode
Mode
Mode
Mode
Countdown
Countdown
Stopwatch Mode
Stopwatch Mode
Timer Mode
Timer Mode
General Functions (All Modes)
The functions and operations described in this section can be used in all of the modes.
Auto Return Features
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The watch returns to the Timekeeping Mode automatically if you do not perform any button operation
for two or three minutes in the Sunrise/Sunset, Data Recall, Alarm, Receive, or Digital Compass Mode.
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If you leave a screen with fl ashing digits on the display for two or three minutes without performing any
operation, the watch exits the setting screen automatically.
Initial Screens
When you enter the World Time, Alarm, or Digital Compass Mode, the data you were viewing when you
last exited the mode appears fi rst.
Scrolling
The A and C buttons are used on the setting screen to scroll through data on the display. In most
cases, holding down these buttons during a scroll operation scrolls through the data at high speed.
Timekeeping
Use the Timekeeping Mode to set and view the current time and date.
Pressing E while in the Timekeeping Mode will cycle through the Timekeeping Mode display formats
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as shown below.
Day of the Week Screen
PM
Day of
Month
indicator
week
Day
Hour : Minutes
Seconds
Operation Guide 3172
Timekeeping Mode
Timekeeping Mode
Sunrise/Sunset
Sunrise/Sunset
Mode
Mode
Alarm Mode
Alarm Mode
Receive Mode
Receive Mode
Year Screen
Barometric Pressure
Graph Screen
Barometric
Year
pressure graph
Mode Reference Guide
Your watch has 11 "modes". The mode you should select depends on what you want to do.
To do this:
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View the current date in the Home City
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Confi gure Home City and daylight saving time (DST) settings
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Confi gure time and date settings manually
View the sunrise and sunset times for a specifi c date
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Determine your current bearing or the direction from your current
location to a destination as a direction indicator and angle value
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Determine your current location using the watch and a map
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View the barometric pressure and temperature at your current location
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View a graph of barometric pressure readings
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View the altitude at your current location
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Determine the altitude differential between two locations (reference
point and current location)
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Record an altitude reading with the measurement time and date
Recall records created in the Altimeter Mode
View the current time in one of 48 cities (31 time zones) around the globe World Time Mode
Use the stopwatch to measure elapsed time
Use the countdown timer
Set an alarm time
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Perform a time calibration receive operation
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Check whether the last receive operation was successful
You can use buttons A, B, and C to enter a sensor mode directly from the Timekeeping Mode or
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from another sensor mode. To enter a sensor mode from the Sunrise/Sunset Mode, Data Recall, World
Time, Stopwatch, Countdown Timer, Alarm, or Receive Mode, fi rst enter the Timekeeping Mode and
then press the applicable button.
Digital Compass Mode
Digital Compass Mode
Confi guring Home City Settings
There are two Home City settings: actually selecting the Home City and selecting either standard time or
daylight saving time (DST).
PM
PM
City
City
Month
Month
To confi gure Home City settings
indicator
indicator
code
code
Day
Day
1. In the Timekeeping Mode, hold down E until the currently selected
city code starts to fl ash. This is the city code setting screen.
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Before the city code starts to fl ash, the message SET Hold
will appear on the display. Keep E depressed until SET Hold
disappears and the city code starts to fl ash.
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The watch will exit the setting mode automatically if you do not
perform any operation for about two or three minutes.
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For details about city codes, see the "City Code Table".
2. Press A (East) and C (West) to select the city code you want to use
as your Home City.
Hour : Minutes
Hour : Minutes
Seconds
Seconds
Keep pressing A or C until the city code you want to select as
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DST indicator
DST indicator
your Home City appears on the display.
3. Press D to display the DST setting screen.
4. Use A to cycle through the DST settings in the sequence shown below.
Auto DST (AUTO)
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The Auto DST (AUTO) setting will be available only when a city code that supports time calibration
signal reception is selected as the Home City. While Auto DST is selected the DST setting will be
changed automatically in accordance with time calibration signal data.
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Note that you cannot switch between standard time and daylight saving time (DST) while UTC is
selected as your Home City.
5. After all the settings are the way you want, press E twice to return to the Timekeeping Mode.
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The DST indicator appears to indicate that Daylight Saving Time is turned on.
Note
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After you specify a city code, the watch will use UTC* offsets in the World Time Mode to calculate
the current time for other time zones based on the current time in your Home City.
* Coordinated Universal Time, the world-wide scientifi c standard of timekeeping.
The reference point for UTC is Greenwich, England.
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Selecting some city codes automatically makes it possible for the watch to receive the time
calibration signal for the corresponding area. See "Radio Controlled Atomic Timekeeping" for
details.
Enter this mode:
Timekeeping Mode
Sunrise/Sunset Mode
Digital Compass Mode
Barometer/Thermometer Mode
Altimeter Mode
Data Recall Mode
Stopwatch Mode
Countdown Timer Mode
Alarm Mode
Receive Mode
Sensor Modes
Sensor Modes
Barometer/
Barometer/
Thermometer Mode
Thermometer Mode
Altimeter Mode
Altimeter Mode
DST off (OFF)
DST on (On)
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