Casio MO0804-EA User Manual

4

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.

• If you leave the watch in the Alarm or Home Position Adjustment 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.

• The B button is used to change the hand and digital display setting in various

setting modes. In most cases, holding down this button will change the applicable
setting at high speed.

• 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 automatically for the period January 1,

2000 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.

• 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 or when battery power drops to
Level 3.

• 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 Coordinated Universal Time (UTC) offset of each
zone, based on your Home Time Zone time setting.

• 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.

• 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.

• 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.

• 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 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.

More than 15 degrees
too high

Tachymeter bezel

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

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.

• 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.

–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
La Paz, Santiago, Port of Spain
Rio De Janeiro, Sao Paulo, Buenos Aires, Brasilia,
Montevideo

Praia

UT 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

UT 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

(UTC)
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, Colombo
Dhaka
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 June 2007.

• The rules governing global times (GMT differential and UTC offset) and summer time

are determined by each individual country.