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Operation Guide 4723
4
Warning!
• Always make sure you are in a safe place whenever you are reading the face
of watch using the auto light switch. Be especially careful when running or
engaged in any other activity that can result in accident or injury. Also take
care that sudden illumination by the auto light switch does not startle or
distract others around you.
• When you are wearing the watch, make sure that its auto light switch is turned
off before riding on a bicycle, or operating a motorcycle or any other motor
vehicle. Sudden and unintended operation of the auto light switch can create a
distraction, which can result in a traffic accident and serious personal injury.
To turn the auto light switch on and off
In Timekeeping mode (except when a setting screen is on the display), hold down B
for about three seconds to toggle the auto light switch on and off.
• Turning on the auto light switch will cause the watch to beep. The “ON” indicator will
appear and the light will turn on for 1.5 seconds.
• Turning off the auto light switch will cause the watch to beep. The “OFF” indicator will
appear for 1.5 seconds. The light will not turn on.
• In order to protect against running down the battery, the auto light switch
automatically turns off approximately six hours after you turn it on.
Reference
This section contains more detailed and technical information about watch operation.
It also contains important precautions and notes about the various features and
functions of this watch.
Auto Return Features
• If you leave the watch in the Alarm, or Hand Setting Mode for two or three minutes
without performing any operation, it returns to the Timekeeping Mode automatically.
• If you do not perform any operation for about two or three minutes while a setting
mode is selected, the watch will exit the setting mode automatically.
Scrolling
• B is used to change the hand setting in various setting modes. In most cases,
holding down this button will start high-speed movement of the applicable hand(s).
• High-speed movement of hands will continue until you press any button, or until the
moving hand(s) finishes one complete cycle.
- One complete cycle for the hands is one revolution (360 degrees) or 24 hours.
Radio-controlled Atomic Timekeeping Precautions
• Strong electrostatic charge can result in the wrong time being set.
• The time calibration signal bounces off the ionosphere. Because of this, such factors
as changes in the reflectivity of the ionosphere, as well as movement of the
ionosphere to higher altitudes due to seasonal atmospheric changes or the time of
day may change the reception range of the signal and make reception temporarily
impossible.
• Even if the time calibration signal is received properly, certain conditions can cause
the time setting to be off by up to one second.
• The current time setting in accordance with the time calibration signal takes priority
over any time settings you make manually.
• The watch is designed to update the date and day of the week automatically for the
period January 1, 2001 to December 31, 2099. Setting of the date by the time
calibration signal cannot be performed starting from January 1, 2100.
• This watch can receive signals that differentiate between leap years and non-leap
years.
• Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to time
data only.
• If you are in an area where proper time calibration signal reception is impossible, the
watch keeps time within ±20 seconds a month at normal temperature.
• If you have problems with proper time calibration signal reception or if the time
setting is wrong after signal reception, check your current time zone, and DST
(summer time).
Transmitters
This watch is designed to receive the time calibration signal transmitted from
Mainflingen, Germany and the signal from Rugby, England. You can configure the
watch to automatically select the transmitter that has the strongest signal.
In this case:
The first signal auto search operation
after factory default settings are in effect,
or after the time zone has been changed
Any case other than the above.
The watch does this:
1. Checks the Mainflingen signal first.
2. If the Mainflingen signal cannot be
received, checks the Rugby signal.
1. Checks the last successfully received
signal first.
2. If the last successfully received signal
cannot be received, checks the other
signal.
Timekeeping
• The year can be set in the range of 2001 to 2099.
• The watch’s built-in full automatic calendar makes allowances for different month
lengths and leap years. Once you set the date, there should be no reason to change
it except after you have the watch’s battery replaced.
• The date will change automatically when the current time reaches midnight. The
date change at the end of the month may take more time than normal.
• The current time for all time zones in the Timekeeping Mode and Dual Time Mode is
calculated in accordance with the Greenwich Mean Time (GMT) differential of each
zone, based on your Home Time Zone time setting.
• GMT differential is calculated by this watch based on Universal Time Coordinated
(UTC*) data.
* UTC is the world-wide scientific standard of timekeeping. It is based upon carefully
maintained atomic (cesium) clocks that keep time accurately to within
microseconds. Leap seconds are added or subtracted as necessary to keep UTC
in sync with the Earth’s rotation. The reference point for UTC is Greenwich,
England.
Illumination Precautions
• The illumination provided by the light may be hard to see when viewed under direct
sunlight.
• Illumination automatically turns off whenever an alarm sounds.
• Frequent use of illumination shortens the battery operating time.
Auto light switch precautions
• Wearing the watch on the inside of your wrist, movement of your arm, or vibration of
your arm can cause frequent activation of the auto light switch and illuminate the
face of the watch. To avoid running down the battery, turn off the auto light switch
whenever engaging in activities that might cause frequent illumination of the face.
• Note that wearing the watch under your sleeve while the auto light switch is turned
on can cause frequent illumination of the face and can run down the battery.
• Illumination may not turn on if the face of the watch is
more than 15 degrees above or below parallel. Make
sure that the back of your hand is parallel to the ground.
• Illumination turns off after about 1.5 seconds, even if you
keep the watch pointed towards your face.
• Static electricity or magnetic force can interfere with
proper operation of the auto light switch. If illumination
does not turn on, try moving the watch back to the
starting position (parallel with the ground) and then tilt it
back towards your face again. If this does not work, drop
your arm all the way down so it hangs at your side, and
then bring it back up again.
More than 15 degrees
too high
• Under certain conditions, illumination may not turn on until about one second after
you turn the face of the watch towards you. This does not necessarily indicate
malfunction of the auto light switch.
• You may notice a very faint clicking sound coming from the watch when it is shaken
back and forth. This sound is caused by mechanical operation of the auto light
switch, and does not indicate a problem with the watch.
Tachymeter
If your watch has a tachymeter bezel, you can perform the
steps below to calculate average speed after using the
Stopwatch Mode to measure the amount of time that it
takes to travel one kilometer (or one mile).
• Never try to perform stopwatch operations while you
are driving an automobile, riding a bicycle, or
operating any type of vehicle. Doing so is very
dangerous and can result in accident.
1 In the Stopwatch Mode, start an elapsed time
operation at any point you like.
2 Stop the elapsed time operation after you travel one
kilometer or one mile.
3 Your average speed will be the value that the second
hand is pointing to on the tachymeter bezel.
• The illustration shows an example where it took 50 seconds to travel one kilometer
by car. The second hand is pointing at 70, which indicates that the average speed is
70 kilometers per hour.
Tachymeter bezel
60
3
6
0
200
1
5
0
120
100
80
70
T
A
C
H
Y
M
E
T
E
R
70
• See “Stopwatch” for details about using the stopwatch.
• The tachymeter can be used only when you are traveling by car or some other
means that can cover one kilometer or one mile within 60 seconds.
GMT Differential Value
Major Cities in Time Zone
Standard Time
DST/Summer Time
Time Zone Table
–11.0
–10.0
–9.0
–8.0
–7.0
–6.0
–5.0
–4.0
–3.0
–2.0
–1.0
DST –10.0
DST –9.0
DST –8.0
DST –7.0
DST –6.0
DST –5.0
DST –4.0
DST –3.0
DST –2.0
DST –1.0
DST +0.0
Pago Pago
Honolulu, Papeete
Anchorage, Nome
Los Angeles, San Francisco, Las Vegas, Vancouver,
Seattle/Tacoma, Dawson City, Tijuana
Denver, El Paso, Edmonton, Culiacan
Chicago, Houston, Dallas/Fort Worth, New Orleans,
Mexico City, Winnipeg
New York, Montreal, Detroit, Miami, Boston,
Panama City, Havana, Lima, Bogota
Caracas, La Paz, Santiago, Port of Spain
Rio De Janeiro, Sao Paulo, Buenos Aires, Brasilia,
Montevideo
Praia
G 0.0
+0.0
+1.0
+2.0
+3.0
+3.5
+4.0
+4.5
+5.0
+5.5
+6.0
+6.5
+7.0
G 0.0
DST +1.0
DST +2.0
DST +3.0
DST +4.0
DST +4.5
DST +5.0
DST +5.5
DST +6.0
DST +6.5
DST +7.0
DST +7.5
DST +8.0
(GMT)
London, Dublin, Lisbon, Casablanca, Dakar, Abidjan
Paris, Milan, Rome, Madrid, Amsterdam, Algiers,
Hamburg, Frankfurt, Vienna, Stockholm, Berlin
Cairo, Jerusalem, Athens, Helsinki, Istanbul, Beirut,
Damascus, Cape Town
Jeddah, Kuwait, Riyadh, Aden, Addis Ababa, Nairobi,
Moscow
Tehran, Shiraz
Dubai, Abu Dhabi, Muscat
Kabul
Karachi, Male
Delhi, Mumbai, Kolkata
Dhaka, Colombo
Yangon
Bangkok, Jakarta, Phnom Penh, Hanoi, Vientiane
+8.0
+9.0
+9.5
+10.0
+11.0
+12.0
DST +9.0
DST +10.0
DST +10.5
DST +11.0
DST +12.0
DST +13.0
Hong Kong, Singapore, Kuala Lumpur, Beijing, Taipei,
Manila, Perth, Ulaanbaatar
Tokyo, Seoul, Pyongyang
Adelaide, Darwin
Sydney, Melbourne, Guam, Rabaul
Noumea, Port Vila
Wellington, Christchurch, Nadi, Nauru Island
• Based on data as of December 2005.