Operation Guide 5242
Radio Controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting accordingly. However, when using the watch outside of areas covered by time calibration signals, you will have to adjust the settings manually as required. See “Configuring Current Time and Date Settings Manually” (page
This section explains how the watch updates its time settings when the city code selected as the Home City is in Japan, North America, Europe, or China, and is one that supports time calibration signal reception.
| If your Home City Code setting is this: | The watch can receive the signal from the transmitter | |
| located here: | ||
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LON (LONDON), PAR (PARIS), ATH (ATHENS) | Anthorn (England), Mainflingen (Germany) | |
HKG (HONG KONG) | Shangqiu City (China) | |
TYO (TOKYO) | Fukushima (Japan), Fukuoka/Saga (Japan) | |
NYC (NEW YORK), CHI (CHICAGO), |
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DEN (DENVER), LAX (LOS ANGELES), | Fort Collins, Colorado (United States) | |
ANC (ANCHORAGE), HNL (HONOLULU) |
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Important!
•The areas covered by HNL (HONOLULU) and ANC (ANCHORAGE) are quite far from the calibration signal transmitters, so certain conditions may cause reception problems.
Anthorn 500 kilometers 1,500 kilometers
The Anthorn signal is receivable | Mainflingen | |
within this area. | ||
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Fukushima
500 kilometers
Fukuoka/Saga
1,000 kilometers
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
Chinese Signal500 kilometers | Changchun |
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
1,500 kilometers
•Signal reception may not be possible at the distances noted below during certain times of the year or day. Radio interference may also cause problems with reception.
–Mainflingen (Germany) or Anthorn (England) transmitters: 500 kilometers (310 miles)
–Fort Collins (United States) transmitter: 600 miles (1,000 kilometers)
–Fukushima or Fukuoka/Saga (Japan) transmitters: 500 kilometers (310 miles)
–Shangqiu (China) transmitter: 500 kilometers (310 miles)
•As of December 2010, China does not use Daylight Saving Time (DST). If China does go to the Daylight Saving Time system in the future, some functions of this watch may no longer operate correctly there.
•Using this watch in a country covered by a time calibration signal that is different from the countries it supports may result in incorrect time indication due to local application of summer time, etc.
•When using this watch in an area where time calibration signal reception is not possible, you can adjust the time and date manually.
To get ready for a receive operation1. Place the watch in a location where signal reception is good.
•Position the watch as shown in the nearby illustration,
| with 12 o’clock pointed towards a window. Make sure | |
12 o’clock | there are no metal objects nearby. | |
• Signal reception normally is better at night. | ||
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| • The receive operation takes from three to eight minutes, | |
or | but in some cases it can take as long as 16 minutes. | |
Take care that you do not perform any button operation |
or move the watch during this time.
•Signal reception may be difficult or even impossible under the conditions described below.
Inside or among Inside a vehicle | Near household | Near a | Near high- | Among |
buildings | appliances, | construction | tension power | or behind |
| office | site, airport | lines | mountains |
| equipment, or a |
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| mobile phone |
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2.What you should do next depends on whether you are using Auto Receive or Manual Receive.
•Auto Receive: Leave the watch over night in the location you selected in step 2. See “Auto Receive” for details.
•Manual Receive: Perform the operation under “To perform manual receive”.
Auto Receive•With Auto Receive, the watch performs the receive operation each day automatically up to six times (up to five times for the Chinese calibration signal) between the hours of midnight and 5 a.m. When any receive operation is successful, none of the other receive operations for that day are performed.
•When a calibration time is reached, the watch will perform the receive operation. The receive operation is not performed if a calibration time is reached while you are configuring settings.
Use B to select the Receive Mode (R/C) as shown on page
•The v Mode Hand will move to R/C.
•The c Second Hand will move to Y (YES) if the latest receive operation
was successful, or N (NO) if it was not.
Note
•It takes about 30 seconds before signal reception conditions stabilize.
•To interrupt a receive operation and return to regular timekeeping, press any button.
To turn auto receive on or off1. In the Receive Mode (R/C), loosen the crown and then pull it out. |
30 
30 
Note
The c Second Hand will indicate N (NO) if you have adjusted the time or date setting manually since the latest receive operation.
1.Use B to select the Receive Mode (R/C) as shown on page
2.In the Receive Mode (R/C), hold down A for at least two seconds.
•The c Second Hand will indicate R (READY) while the watch is getting ready to receive a time calibration signal, and W (WORK) while a receive operation is in progress.
•If the receive operation is successful, the watch will automatically adjust its time settings and the c Second Hand will point to Y (YES). It does not adjust the setting if the operation failed.
• The c Second Hand will point to Y (YES) if auto receive is currently |
on, and N (NO) if it is off. |
2. Press C to toggle auto receive between on and off.
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| 3. After the setting is the way you want, push the crown back in and lock |
| 30 | it. |
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| • The watch will return to the last receive result (Y/N). |
Y (YES) | N (NO) |
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•Time calibration signal reception is performed automatically while the watch is in the Timekeeping Mode.
•Strong electrostatic charge can result in the wrong time setting.
•Even if a receive operation is successful, certain conditions can cause the time setting to be off by up to one second.
•The watch is designed to update the date automatically for the period from January 1, 2000 to December 31, 2099. Updating of the date by signal reception will no longer be performed starting from January 1, 2100.
•If you are in an area where signal reception is not possible, the watch keeps time with the precision noted in “Specifications” (page
•The receive operation is disabled under any of the following conditions.
–While power is at Level 2 or lower (page
–While the watch is in the power recovery mode (page
–While the watch is in the function sleep state (power saving, page
•A receive operation is cancelled if an alarm sounds while it is being performed.
Mode Reference Guide
Your watch has 8 “modes”. The mode you should select depends on what you want to do.
| To do this: | Enter this mode: | See: | |
• View the current time, date, and day of the week | Timekeeping Mode | ||
• Home City, time, and summer time settings | |||
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Determine magnetic north | Digital Compass Mode | ||
Determine the altitude at your current location | Altimeter Mode | ||
• Determine the barometric pressure at your current location | Barometer Mode | ||
• Barometric pressure differential | |||
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Determine the temperature at your current location | Thermometer Mode | ||
• Set an alarm time | Alarm Mode | ||
• Turn the alarm on or off | |||
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Use the stopwatch to measure elapsed time | Stopwatch Mode | ||
• Perform a manual time calibration signal receive operation |
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• Check whether the last receive operation was successful | Receive Mode | ||
• Configure Auto Receive settings |
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