To swap your Home City and World Time City
E-33 Using the Stopwatch
To enter and exit the Stopwatch Mode
To measure elapsed time
To measure split times
E-35 Auto Start
To set the Auto Start Time
To start an Auto Start operation
E-37 Adjusting Home Positions
To adjust home positions
E-44 Speciﬁ cations
Keep the watch in an area normally exposed to bright light when storing it for long periods. This helps
to ensure that power does not run down.
Storing the watch for long periods in an area where there is no light or wearing it in such a way that it is
blocked from exposure to light can cause power to run down. Make sure that the watch is exposed to
bright light whenever possible.
You can get an idea of the watch's power level by observing the movement of
the x Second Hand.
If the x Second Hand is moving normally at one-second intervals, power is
at Level 1.
If the x Second Hand is moving at two-second intervals, power is at Level 2,
which is quite low. Expose the watch to light as soon as possible so it can
charge (Low battery alert).
Level Hand Movement
x x Second Hand moves at
x x Second Hand stopped.
Moves at two-second
z z Hour Hand and c c Minute Hand
stopped at 12 o'clock.
. . Day Indicator between 31 and 1.
When power drops to Level 3, all settings (including timekeeping) will be cleared. Recharging the
battery will reset all settings to their initial factory defaults, so you will need to conﬁ gure settings again.
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.
Elapsed Time in Dark
All hands stopped at 12 o'clock
Approximately 1 week
Internal timekeeping maintained
To recover from the sleep state
Move the watch to a well-lit area or press any button.
Approximate Reception Ranges
UK and German Signals
The Anthorn signal is receivable
within this area.
Operation Guide 5285 (OC)
All functions enabled
Time calibration signal reception and
home position adjustment disabled
All functions disabled
North American Signal
Charging the Watch
The face of the watch is a solar panel that generates power from light. The generated power charges a
built-in rechargeable battery, which powers watch operations. The watch charges whenever it is exposed
Whenever you are not
wearing the watch, be sure
to leave it in a location where
it is exposed to light.
performance is achieved
by exposing the watch to
light that is as strong as
Leaving the watch in bright light for charging can cause it to become quite hot. Take care when
handling the watch to avoid burn injury. The watch can become particularly hot when exposed to
the following conditions for long periods.
On the dashboard of a car parked in direct sunlight
Too close to an incandescent lamp
Under direct sunlight
When the watch is at Level 3, exposing it to light for a while will cause the x Second Hand to move to
the position of second 57. This indicates that charging has started.
Power Recovery Mode
The watch is designed to go into a power recovery mode that stops hand operation temporarily whenever
power suddenly drops below a certain level due to continuous signal reception or other operations over a
short period. Note that all operations are disabled while the watch is in the power recovery mode.
The hands will move to the correct positions and the watch will resume normal operation after power
recovers (in about 15 minutes). Putting the watch in a location where it is exposed to light will help power
to recover sooner.
Exposure Level (Brightness)
Outdoor sunlight (50,000 lux)
Window sunlight (10,000 lux)
Window sunlight on cloudy day (5,000 lux)
Indoor ﬂ uorescent lighting (500 lux)
1 Approximate exposure each day to generate power for normal daily operation.
2 Approximate exposure to take power up one level.
The above times are for reference only. Actual 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-44).
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-26) for more
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
If your Home City Code setting is this:
LONDON (LON), PARIS (PAR), ATHENS (ATH)
HONG KONG (HKG)
NEW YORK (NYC), CHICAGO (CHI),
DENVER (DEN), LOS ANGELES (LAX),
ANCHORAGE (ANC), HONOLULU (HNL)
The areas covered by HONOLULU (HNL) and ANCHORAGE (ANC) are quite far from the calibration
signal transmitters, so certain conditions may cause reception problems.
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 June 2012, 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 for the
China time zones.
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.
To get ready for a receive operation
Conﬁ rm that the watch is in the Dual Time Mode. If it isn't, hold down
the Dual Time Mode.
Place the watch in a location where signal reception is good.
When wearing the watch, makes
sure that its face is not blocked
from light by the sleeve of your
The watch may enter a sleep
state (page E-12) if its face is
blocked by your sleeve even
Level Change *2
The watch can receive the signal from the transmitter
Anthorn (England), Mainﬂ ingen (Germany)
Shangqiu City (China)
Fukushima (Japan), Fukuoka/Saga (Japan)
Fort Collins, Colorado (United States)
C at least two seconds to enter
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 two to 10 minutes, but
in some 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.
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