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E-23
• 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
3. 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”
be
low for details.
• Manual receive: Perform the operation under “To perform manual receive” on page E-24.
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. (according to
the Timekeeping Mode time). 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 only if it is in the
Timekeeping Mode. The receive operation is not performed if a calibration time is reached while you
are confi
guring settings.
E-22
• Even when the watch is within range of a transmitter, signal reception may be impossible due to the
effects of geographic contours, structures, weather, the time of year, the time of day, radio interference,
etc. The signal becomes weaker at distances of approximately 500 kilometers, which means that the
infl
uence of the conditions listed above becomes even greater.
• 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 January 2016, 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.
To get ready for a receive operation
1. Confi
rm that the watch is in the Timekeeping Mode. If it isn’t, use
B
to enter the Timekeeping Mode
(page E-30).
2. The antenna of this watch is located on its 7 o’clock side. Position the watch with 7 o’clock facing
towards a window as shown in the nearby illustration. Make sure there are no metal objects nearby.
• Signal reception normally is better at night.
• The receive operation takes from two to ten minutes, but
i
n s
ome cases it can take as long as 20 minutes. Take
care that you do not perform any button operation or
move the watch during this time.
or
7 o’clock
E-21
Approximate Reception Ranges
UK and German Signals
Japanese Signals Chinese Signal
North American Signal
Anthorn
Mainfl ingen
Fukushima
500 kilometers
Fukuoka/Saga
1,000 kilometers
500 kilometers
Changchun
Beijing
Shangqiu
Shanghai
Chengdu
Hong Kong
1,500 kilometers
2,000 miles
(3,000 kilometers)
600 miles
(1,000 kilometers)
Fort Collins
For the Honolulu and Anchorage time zones, the
signal can be received when reception conditions
are favorable.
500 kilometers
1,500 kilometers
The Anthorn signal is
receivable within this area
E-20
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-36) for more
information.
This section explains how the watch updates its time settings automatically 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:
LIS, LON, MAD, PAR, ROM, BER, STO, ATH, MOW Anthorn (England), Mainfl ingen (Germany)
HKG, BJS Shangqiu City (China)
TPE, SEL, TYO Fukushima (Japan), Fukuoka/Saga (Japan)
HNL, ANC, YVR, LAX, YEA, DEN, MEX, CHI, NYC, YHZ,
YYT
Fort Collins, Colorado (United States)
Important!
• The areas covered by
MOW
,
HNL
and
ANC
are quite far from the calibration signal transmitters, so
certain conditions may cause reception problems.
• When
HKG
or
BJS
is selected as the Home City, only the time and date are adjusted according to the
time calibration signal. You need to switch manually between standard time and daylight saving time
(DST) if required. See “To confi
gure Home City and summer time settings” (page E-34) for information
about how to do this.
E-19
Power Saving
When turned on, Power Saving enters a sleep state automatically whenever the watch is left for a certain
period in an area where it is dark. The table below shows how watch functions are affected by Power
Saving.
• For information about enabling and disabling power saving, see “To enable or disable Power Saving”
(page E-115).
• There actually are two sleep state levels: “display sleep” and “function sleep”.
Elapsed Time in Dark Hands and Display Operation
60 to 70 minutes (display sleep)
Blank display, second hand
stopped.
Except for display and second hand, all
functions enabled.
6 or 7 days (function sleep)
Blank display, all hands
stopped at 12 o’clock.
Except for timekeeping, all functions
disabled.
• The watch will not enter a sleep state between 6:00 a.m. and 9:59 p.m.. If the watch is already in a
sleep state when 6:00 a.m. arrives, however, it will remain in the sleep state.
• The watch will not enter a sleep state while it is in the World Time Mode, Stopwatch Mode or
Countdown Timer Mode.
• The watch will not enter a sleep state while the barometric pressure change indicator is enabled (page
E-49).
To recover from the sleep state
Move the watch to a well-lit area, press any button, or angle the watch towards your face for reading (page
E-112).
E-18
Charging Times
Exposure Level (Brightness)
Daily
Operation
*1
Level Change *2
Level 5 Level 4 Level 3 Level 2 Level 1
Outdoor sunlight (50,000 lux) 8 min. 2 hours 20 hours 6 hours
Sunlight through a window (10,000 lux)
30 min. 6 hours 74 hours 20 hours
Daylight through a window on a
cloudy day (5,000 lux)
48 min. 9 hours 120 hours 32 hours
Indoor fl uorescent lighting (500 lux) 8 hours 103 hours – – – – – –
*1 Approximate amount of exposure time required each day to generate enough power for normal daily
operation.
*2 Approximate amount of exposure time (in hours) required to take power from one level to the next.
• The above exposure times all are for reference only. Actual exposure times depend on lighting
conditions.
• For details about the operating time and daily operating conditions, see the “Power Supply” section of
the Specifi
cations (page E-129).
E-17
Power Recovery Mode
• Performing multiple sensor, illumination, or beeper operations during a short period may cause the
recovery indicator (
RECOVER
) to start fl ashing on the display. This indicates that the watch is in the
power recovery mode. Illumination, alarm, countdown timer alarm, hourly time signal, and sensor
operations will be disabled until battery power recovers.
• Battery power will recover in about 15 minutes. At this time, the recovery indicator (
RECOVER
) will stop
fl
ashing. This indicates that the functions listed above are enabled again.
• Frequent fl ashing of the recovery indicator (
RECOVER
) indicates that battery power is low. Expose the
watch to bright light as soon as possible.
• Even if battery power is at Level 1 (
H
) or Level 2 (
M
), sensor measurement may be disabled, and Tide/
Moon Data Mode and Sunrise/Sunset Mode access may not be possible if there is not enough power
available to power it suffi
ciently. This is indicated when the recovery indicator (
RECOVER
) is fl ashing.
• Frequent fl ashing of the recovery indicator (
RECOVER
) probably means that remaining battery power
is low. Leave the watch in bright light to allow it to charge.
E-16
• Leaving the watch exposed to direct sunlight or some other very strong light source can cause the
battery power indicator to show a reading temporarily that is higher than the actual battery level. The
correct battery level should be indicated after a few minutes.
• All data stored in memory is deleted, and the current time and all other settings return to their initial
factory defaults whenever battery power drops to Level 5 and when you have the battery replaced.
A dark environment while battery power is at Level 4 will cause the level to drop to Level 5. Expose the
watch to bright light whenever possible.
Low battery alert
When battery power reaches Level 3, the second hand of the watch will
jump at 2-second intervals in the Timekeeping Mode to let you know that
charging is required.
l
l
l
l
l
l
l
l
l
Jumps at two-second
intervals
Operation Guide 5477
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