Time Correction
Your watch can obtain date and time information by connecting with a phone and by receiving time signals, which it uses to adjust its settings.
Important!
When you are on an aircraft or in any other location where radio signals may cause problems, enable the watch’s Airplane Mode to disable connection with your phone.
Referring to the information below, configure the time setting in accordance with the method that suits your own lifestyle.
Do you use a phone?
Can you receive a time signal in your area?
While the watch’s Home Time City setting is one where a time signal can be received, the watch’s time and day settings can be adjusted in accordance with the signal.
Other than the above.
If you are unable to connect with a phone and are unable to receive a time signal, you can perform watch button operations to adjust its time setting.
Time Adjustment Using a Time Signal
Overview
The watch’s time and day settings can be configured in accordance with a received time calibration signal.
Important!
In order to make it possible for the current time setting to be adjusted correctly based on time calibration signal reception, you need to specify the time zone where you are using the watch.
If the watch was unable to connect with a phone even once for time correction during the previous day while connection with a phone is being used, it will automatically try to receive a time calibration signal.
Note
Areas where time calibration signal reception is supported are limited. When the watch is in an area where time calibration signal reception is not possible, connect with a phone to adjust time and day settings.
Appropriate Signal Reception Location
A time calibration signal can be received while the watch is near a window.
Position the watch so its 12 o’clock side is facing the window.
Keep metal objects away from the watch.
Do not move the watch.
Do not perform any operation on the watch.
Note
You may experience time calibration signal reception problems in the areas described below.
Among or near buildings
While riding in a vehicle
Near household appliances, office machines, mobile phones, etc.
On a construction site, in an airport, or any other location where radio wave interference occurs
Near high-voltage lines
In mountainous areas or behind a mountain
Time Signal Reception Ranges
Japan (JJY)
The Japan time signal radio stations are located on Mt. Otakadoya in Fukushima and Mt. Hagane in Fukuoka/Saga.
The reception range of the Japanese time signals is approximately 1,000 km from each transmission station.
China (BPC)
The China time signal radio station is located in Shangqiu, Henan Province, China.
The reception range of the Chinese time signal is approximately 1,500 km from the transmission station.
United States (WWVB)
The United States time signal radio station is located in Fort Collins, Colorado.
The reception range of the U.S. time signal is approximately 3,000 km from the transmission station.
U.K. (MSF)/Germany (DCF77)
The U.K. time signal radio station is located in Anthorn, Cumbria.
The German time signal radio station is located in Mainflingen, southeast of Frankfurt.
The reception range of the U.K. and German time signals is approximately 1,500 km from each transmission station.
Note
Even if you are within the normal reception range of a time calibration signal, reception may be made impossible by the following factors: geographic contours, weather, the season, the time of day, wireless noise.
A time calibration signal cannot be received while the city selected as your Home City is one that does not support signal reception.
Auto Time Calibration Signal Receive
An automatic time calibration signal receive operation is performed and the time and day settings are corrected between midnight and 5:00 a.m. Once a signal receive operation is successful, no more auto receive operations are performed that day.
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Place the watch near a window or some other location appropriate for signal reception.
[RC !] is shown on the display while time signal reception is in progress.
When a receive operation is successful, the watch adjusts its current time and day settings automatically, and then returns to the Timekeeping Mode.
Note
Reception takes anywhere from about two minutes to about 10 minutes. It can take as long as 20 minutes.
Enabling and disabling Auto Receive
You can stop auto receive by disabling the Auto Receive setting.
Note
While the Home City setting is one where time signal reception is possible, you can enable or disable auto receive as required.
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Enter the Receive Mode.
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Loosen the crown and then pull it out.
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Rotate the crown to enable or disable Auto Receive.
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Push the crown back in and then lock it.
[AUTORC] appears on the display with [ON] or [OFF] flashing.
Note
If you do not perform any operation for about two minutes after pulling out the crown, crown operations will automatically become disabled. If that happens, push the crown back in and then pull it out again.
Manual Time Calibration Signal Receive
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Place the watch near a window or some other location appropriate for time signal reception.
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Enter the Receive Mode.
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Hold down (A) for at least two seconds until [RC !] appears on the display.
This indicates that the receive operation has started. After the receive operation is complete, the watch’s time and day settings will be corrected accordingly.
The level indicator shows the signal level ([L1], [L2], [L3]) while a receive operation is in progress.
Note
The receive operation takes anywhere from about two minutes to about 10 minutes. It can take as long as 20 minutes.
Time calibration signal reception is better at night than during the day.
Receive Level Indicator
While a receive operation is in progress, its current status is indicated on the display as shown below. Use the level indicator to find a location where signal reception is stable.
Note
It takes about 10 seconds for time signal reception conditions to stabilize.
Reception conditions are affected by weather, the time of day, the surrounding environment, etc.
Checking the Last Time Adjustment Result
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Enter the Receive Mode.
This displays the date and time of the last successful receive operation.
Signal Reception Precautions
When the watch is unable to correct its time in accordance with a calibration signal for some reason, average timekeeping accuracy is within ±15 seconds per month.
Note that an internal decoding process the watch performs after it receives a signal may cause the time setting to be slightly off (by less than one second).
Time calibration signal reception is not possible under the conditions described below.
While battery power is low
While in any mode besides the Timekeeping Mode
When the watch is at Level 2 power saving
While a compass reading, barometric pressure measurement, temperature measurement, or altitude measurement operation is in progress
While the barometric pressure change indication is enabled
While a timer countdown operation is in progress
While auto time correction is disabled
While the Home City area setting is one where time signal reception is not possible
While the watch is outside the time signal reception range
When the receive operation is successful, the time and/or day settings will be corrected automatically. Summer time will not be applied correctly in the case described below.
When the summer time start date and time, end date and time, or other rules are changed by authorities
Using Watch Operations to Adjust the Time Setting
If your watch cannot connect with a phone for some reason, you can use watch operations to adjust date and time settings.
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 enable or disable summer time.
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Enter the Timekeeping Mode.
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Loosen the crown and then pull it out.
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Rotate the crown to display the city you want to use.
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Press (B).
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Rotate the crown to select a summer time setting.
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Push the crown back in and then lock it.
The currently selected Home City will appear on the display.
For information about city codes, refer to the information below.
Rotating the crown cycles through the setting items shown below.
[AUTO]
The watch switches between standard time and summer time automatically.
[OFF]
The watch always indicates standard time.
[ON]
The watch always indicates summer time.
Note
If you do not perform any operation for about two minutes after pulling out the crown, crown operations will automatically become disabled. If that happens, push the crown back in and then pull it out again.
The [AUTO] summer time setting is valid when the watch’s Home City is in an area where a time signal can be received.
Setting the Time/Date
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Enter the Timekeeping Mode.
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Loosen the crown and then pull it out.
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Press (D).
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Rotate the crown to change the minute setting.
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Press (B).
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Rotate the crown to change the hour setting.
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Press (B).
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Rotate the crown to change the year setting.
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Press (B).
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Rotate the crown to change the month.
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Press (B).
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Rotate the crown to change the day.
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On a time signal at the top of a minute, push the crown back in and lock it.
The currently selected Home City will appear on the display.
This causes the hours and minutes digits to flash.
The hour digit changes in sync with the minute digit change.
This causes the hours digits to flash.
This causes the current year setting to flash on the display.
This causes the month to flash on the display.
This causes the day to flash on the display.
Note
If you do not perform any operation for about two minutes after pulling out the crown, crown operations will automatically become disabled. If that happens, push the crown back in and then pull it out again.
Switching between 12-hour and 24-hour Timekeeping
You can specify either 12-hour format or 24-hour format for the time display.
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Enter the Timekeeping Mode.
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Loosen the crown and then pull it out.
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Press (B) five times.
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Rotate the crown to select [12H] (12-hour timekeeping) or [24H] (24-hour timekeeping).
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Push the crown back in and then lock it.
The currently selected Home City will appear on the display.
This causes [12H] or [24H] to flash on the display.
Note
If you do not perform any operation for about two minutes after pulling out the crown, crown operations will automatically become disabled. If that happens, push the crown back in and then pull it out again.
Using the Watch in a Medical Facility or Aircraft
Whenever you are in a hospital, on an aircraft, or in any other location where auto time calibration signal receive or connection with a phone may cause problems, you can perform the procedure below to disable auto time correction. To re-enable auto time correction, perform the same operation again.
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Enter the Receive Mode.
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Loosen the crown and then pull it out.
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Rotate the crown to change the auto time correction setting.
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Push the crown back in and then lock it.
[AUTORC] appears on the display with [ON] or [OFF] flashing.
[OFF]: Auto time correction disabled.
[ON]: Auto time correction enabled.