Congratulations upon your selection of this CASIO watch. To get the most out
of your purchase, be sure to read this manual carefully.
• This watch does not have a time zone that corresponds to the
Greenwich Mean Time differential of –3.5 hours. Because of this, the
radio-controlled timekeeping and World Time functions will not display
the correct time for Newfoundland, Canada.
Keep the watch exposed to bright light
• The watch continues to operate, even when it is not exposed to light.
Leaving the watch in the dark can cause the battery to run down, which will
result in some watch functions being disabled. If the battery goes dead, you
will have to re-configure watch settings after recharging. To ensure normal
watch operation, be sure to keep it exposed to light as much as possible.
Battery charges in the light.
(Converts light to
• The illustration below shows which buttons you need to press to navigate
• In any mode, press L to illuminate the display.
Radio-controlled Atomic Timekeeping
This watch receives a time calibration signal and updates its time setting
• This watch is designed to pick up the time calibration signals transmitted in
Germany (Mainflingen), England (Anthorn), the United States (Fort Collins)
• See the information under "Signal Reception Troubleshooting" if you
experience problems with time calibration signal reception.
Current Time Setting
This watch adjusts its time setting automatically in accordance with a time
calibration signal. You also can perform a manual procedure to set the time
and date, when necessary.
• The first thing you should do after purchasing this watch is to specify
your Home City (the city where you normally will use the watch). For
more information, see "To specify your Home City" below.
Operation Guide 3143
The electricity generated by the solar cell of the
watch is stored by a built-in battery. Leaving or
using the watch where it is not exposed to light
causes the battery to run down. Make sure the
watch is exposed to light as much as possible.
• When you are not wearing the watch on your
wrist, position the face so it is pointed at a
source of bright light.
• You should try to keep the watch outside of
your sleeve as much as possible. Charging is
reduced significantly if the face is covered only
Battery discharges in the dark.
• The actual level at which some functions are disabled depends on the
• Frequent display illumination can run down the battery quickly and require
charging. The following guidelines give an idea of the charging time
required to recover from a single illumination operation.
Approximately five minutes exposure to bright sunlight coming in through
Approximately 50 minutes exposure to indoor fluorescent lighting
• Be sure to read "Power Supply" for important information you need to
know when exposing the watch to bright light.
If the display of the watch is blank...
If the display of the watch is blank, it means that the watch's Power Saving
function has turned off the display to conserve power.
• See "Power Saving" for more information.
The built-in sensors of this watch measure barometric pressure, temperature
and altitude. Measured values are then shown on the display. Such features
make this watch useful when hiking, mountain climbing, or when engaging in
other such outdoor activities.
• The measurement functions built into this watch are not intended for
taking measurements that require professional or industrial precision.
Values produced by this watch should be considered as reasonable
• CASIO COMPUTER CO., LTD. assumes no responsibility for any loss,
or any claims by third parties that may arise through the use of this
About This Manual
• You can use buttons B and D to enter a sensor mode directly from the
Timekeeping Mode or from another sensor mode. To enter a sensor mode
from the Data Recall, World Time, Stopwatch, Countdown Timer, Alarm, or
Receive Mode, first enter the Timekeeping Mode and then press the
• When using the watch outside the areas covered by the time signal
transmitters, you will have to adjust the current time setting manually as
required. See "Timekeeping" for more information about manual time
• The U.S. time calibration signal can be picked up by the watch while in
North America. The term "North America" in this manual refers to the area
that consists of Canada, the continental United States, and Mexico.
• Button operations are indicated using the
letters shown in the illustration.
• Each section of this manual provides you with
the information you need to perform operations
in each mode. Further details and technical
information can be found in the "Reference"