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E-16
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 “Confi guring Current Time and Date Settings Manually” (page E-31) for more
information.
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:
LON (LONDON), PAR (PARIS), ATH (ATHENS) Anthorn (England), Mainfl ingen (Germany)
HKG (HONG KONG) Shangqiu City (China)
TYO (TOKYO) Fukushima (Japan), Fukuoka/Saga (Japan)
NYC (NEW YORK), CHI (CHICAGO),
DEN (DENVER), LAX (LOS ANGELES),
ANC (ANCHORAGE), HNL (HONOLULU)
Fort Collins, Colorado (United States)
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.
E-17
Approximate Reception Ranges
Anthorn
500 kilometers
1,500 kilometers
The Anthorn signal is receivable
within this area.
Mainflingen
Fukushima
1,000 kilometers
Fukuoka/Saga
500 kilometers
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
500 kilometers Changchun
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
1,500 kilometers
UK and German Signals
North American Signal
Chinese SignalJapanese Signals
E-18
• 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.
– Mainfl ingen (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 operation
1. 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
there are no metal objects nearby.
• Signal reception normally is better at night.
• The receive operation takes from three to eight minutes,
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.
12 o’clock
or
12 o’clock
or
E-19
• Signal reception may be diffi cult or even impossible under the conditions described below.
Inside or among
buildings
Inside a vehicle Near household
appliances,
offi ce
equipment, or a
mobile phone
Near a
construction
site, airport
Near high-
tension power
lines
Among
or behind
mountains
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 fi ve 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 confi guring settings.
E-20
To check the result of the latest receive operation
Use
B
to select the Receive Mode (
R/C
) as shown on page E-24.
• The
v
v
Mode Hand
will move to
R/C
.
• The
c
c
Second Hand
will move to
Y
(YES) if the latest receive operation
was successful, or
N
(NO) if it was not.
Note
The
c
c
Second Hand
will indicate
N
(NO) if you have adjusted the time or
date setting manually since the latest receive operation.
To perform Manual Receive
1. Use
B
to select the Receive Mode (
R/C
) as shown on page E-24.
2. In the Receive Mode (
R/C
), hold down
A
for at least two seconds.
• The c
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
c
Second Hand will point to Y (YES).
It does not adjust the setting if the operation failed.
3030
3030
E-21
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 off
1. In the Receive Mode (
R/C
), loosen the crown and then pull it out.
• The c
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.
3. After the setting is the way you want, push the crown back in and lock
it.
• The watch will return to the last receive result (Y/N).
30
Y (YES) N (NO)
30
Y (YES) N (NO)
E-22
Radio-controlled Atomic Timekeeping Precautions
• 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 “Specifi cations” (page E-80).
• The receive operation is disabled under any of the following conditions.
– While power is at Level 2 or lower (page E-12)
– While the watch is in the power recovery mode (page E-13)
– While the watch is in the function sleep state (power saving, page E-15)
• A receive operation is cancelled if an alarm sounds while it is being performed.
E-23
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
• Home City, time, and summer time settings
Timekeeping Mode E-27
Determine magnetic north Digital Compass Mode E-35
Determine the altitude at your current location Altimeter Mode E-42
• Determine the barometric pressure at your current location
• Barometric pressure differential
Barometer Mode E-51
Determine the temperature at your current location Thermometer Mode E-58
• Set an alarm time
• Turn the alarm on or off
Alarm Mode E-63
Use the stopwatch to measure elapsed time Stopwatch Mode E-65
• Perform a manual time calibration signal receive operation
• Check whether the last receive operation was successful
• Confi gure Auto Receive settings
Receive Mode E-16
Operation Guide 5242