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Operation Guide 4719
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, 2000 to December 31, 2099. Setting of the date by the
time calibration signal will not 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 Home 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 Anthorn, England. You can configure the
watch to select the transmitter that has the strongest signal automatically.
In this case:
The watch does this:
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.
Timekeeping
• The year can be set in the range of 2000 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
more than 15 degrees above or below parallel. Make
too high
sure that the back of your hand is parallel to the ground.
• Illumination turns off in about one second, 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.
• 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
Tachymeter bezel
steps below to calculate average speed after using the
60
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.
1. Checks the Mainflingen signal first.
2. If the Mainflingen signal cannot be
received, checks the Anthorn signal.
1. Checks the last successfully received
signal first.
2. If the last successfully received signal
cannot be received, checks the other
signal.
• 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.
Time Zone Table
GMT Differential Value
Standard Time DST/Summer Time
–11.0
DST –10.0
Pago Pago
–10.0
DST
–9.0
Honolulu, Papeete
–9.0
DST
–8.0
Anchorage, Nome
–8.0
DST
–7.0
Los Angeles, San Francisco, Las Vegas, Vancouver,
Seattle/Tacoma, Dawson City, Tijuana
–7.0
DST
–6.0
Denver, El Paso, Edmonton, Culiacan
–6.0
DST
–5.0
Chicago, Houston, Dallas/Fort Worth, New Orleans,
Mexico City, Winnipeg
–5.0
DST
–4.0
New York, Montreal, Detroit, Miami, Boston,
Panama City, Havana, Lima, Bogota
–4.0
DST
–3.0
Caracas, La Paz, Santiago, Port of Spain
–3.0
DST
–2.0
Rio De Janeiro, Sao Paulo, Buenos Aires, Brasilia,
Montevideo
–2.0
DST
–1.0
–1.0
DST
+0.0
Praia
G 0.0
G 0.0
(GMT)
+0.0
DST
+1.0
London, Dublin, Lisbon, Casablanca, Dakar, Abidjan
+1.0
DST
+2.0
Paris, Milan, Rome, Madrid, Amsterdam, Algiers,
Hamburg, Frankfurt, Vienna, Stockholm, Berlin
+2.0
DST
+3.0
Cairo, Jerusalem, Athens, Helsinki, Istanbul, Beirut,
Damascus, Cape Town
+3.0
DST
+4.0
Jeddah, Kuwait, Riyadh, Aden, Addis Ababa, Nairobi,
Moscow
+3.5
DST
+4.5
Tehran, Shiraz
+4.0
DST
+5.0
Dubai, Abu Dhabi, Muscat
+4.5
DST
+5.5
Kabul
+5.0
DST
+6.0
Karachi, Male
+5.5
DST
+6.5
Delhi, Mumbai, Kolkata, Colombo
+6.0
DST
+7.0
Dhaka
+6.5
DST
+7.5
Yangon
+7.0
DST
+8.0
Bangkok, Jakarta, Phnom Penh, Hanoi, Vientiane
+8.0
DST
+9.0
Hong Kong, Singapore, Kuala Lumpur, Beijing, Taipei,
Manila, Perth, Ulaanbaatar
+9.0
DST +10.0
Tokyo, Seoul, Pyongyang
+9.5
DST +10.5
Adelaide, Darwin
+10.0
DST +11.0
Sydney, Melbourne, Guam, Rabaul
+11.0
DST +12.0
Noumea, Port Vila
+12.0
DST +13.0
Wellington, Christchurch, Nadi, Nauru Island
• Based on data as of June 2007.
Major Cities in Same Time Zone
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