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1890-5
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.
Warning Indicators
Warning indicators appear whenever any of the conditions described below
occur. Appearance of a warning indicator causes any measurement opera-
tion that is currently underway to stop. Warning indicators appear in the
upper display, and this causes
--- to replace any direction or temperature
values on the display.
• There may be cause where the
ERR or BAT message is cleared once
you change modes. In this case, you can continue using the watch normally
unless the error warning message reappears.
• Whenever there is a sensor malfunction, be sure to take the watch to an
authorized CASIO distributor or service center as soon as possible.
Abnormal Magnetic Field Indicator
This indicator appears whenever the watch has a problem
obtaining a correct direction reading. This condition could
indicate that the watch is within a very high magnetic field,
and so you should try moving to another location. Also, see
“Digital Compass Precautions” for further information on
conditions that cause errors.
Low Battery Indicator
This message indicates that batteries power is too low to
perform the measurement. It appears whenever batteries
power drops below a certain level, or when you try to use
this watch under very cold conditions (below about –10°C).
If the
BAT message appears because of use under cold conditions, it
should clear (and normal operation should return) after the watch is brought
back to normal temperature.
If batteries power is low (indicated
BAT appears under normal tempera-
tures), you should have the batteries replaced as soon as possible. Note that
replacement of the batteries causes all memory contents to be cleared.
Sensor Malfunction Indicator
This message indicates malfunction of sensor circuitry.
Whenever a sensor malfunction initially occurs, the
ERR
messages flashes on the display. Note that calibrating the
Digital Compass may cause the
ERR message to appear.
In this case, the message does not indicate sensor malfunc-
tion, and should be corrected if you re-calibrate the Digital
Compass.
Auto Return Operations
• After you perform an operation in any mode, pressing D returns to the
Timekeeping Mode.
• If you leave a screen with flashing digits on the display for two or three
minutes without performing any operation, the watch automatically saves
anything you have input up to that point and exits the setting screen.
Data and Setting Scrolling
The B and C buttons are used in various modes and screens to scroll
through data on the display. In most cases, holding down these buttons
during a scroll operation scrolls through the data at high speed.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping
Mode is also applied in the Navigation, World Time, and Alarm Modes.
Backlight Precautions
• The electro-luminescent panel loses illuminating power after very long use.
• The illumination provided by the backlight may be hard to see when viewed
under direct sunlight.
• The watch will emit an audible sound whenever the display is illuminated.
This is caused by a transformer that vibrates when the EL panel lights up. It
does not indicate malfunction of the watch.
• The backlight automatically turns off whenever an alarm sounds.
Auto light switch precautions
• Avoid wearing the watch on the inside of your wrist. Doing so causes the auto
light switch to operate when it is not needed, which shortens battery life.
• The backlight turns off in about two seconds, even if you keep the watch
pointed towards your face.
• The backlight may not light if the face of the watch is more than 15 degrees
off the parallel as shown below. Make sure that the back of your hand is
parallel to the ground.
• Static electricity or magnetic force can interfere with proper operation of the
auto light switch. If the backlight does not light, try moving the watch back to
the starting position (parallel with the ground) and then tilt it back toward
you 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 the backlight may not light until about one second
or less after turn the face of the watch towards you. This does not
necessarily indicate malfunction of the backlight.
World Time Mode
• The seconds count of the World Time is synchronized with the seconds
sound of the Timekeeping Mode.
• GMT differential is calculated by this watch based on Universal Time
Coordinated (UTC) data.
• Average monthly temperature values displayed by this watch are based on
the “WORLD CLIMATE TABLE” published by the Japanese government’s
Meteorological Agency.
Temperature and Direction Reading Precautions
• The direction and temperature reading operation is automatically
interrupted whenever an alarm or Hourly Time Signal sounds. If this
happens, start the reading operation again from the beginning.
• Taking a direction reading while the watch is not horizontal (in relation to the
horizon) can result in large error.
• If the Navigation Mode memory area you select to store a reading already
contains data, the data of the new reading replaces the existing data.
Digital Compass Precautions
This watch features a built-in magnetic bearing sensor that detects terrestrial
magnetism. This means that north indicated by this watch is magnetic north,
which is somewhat different from true polar north. The magnetic north pole is
located in northern Canada, while the magnetic south pole is in southern
Australia. Note that the difference between magnetic north and true north as
measured with all magnetic compasses tends to be greater as one gets
closer to either of the magnetic poles. You should also remember that some
maps indicate true north (instead of magnetic north), and so you should make
allowances when using such maps with this watch.
Direction Values
The direction values displayed by this watch
represent the clockwise angle formed between
magnetic north (which is 0 degrees) and the
direction that the 12 o’clock position of the
watch is pointing.
Location
• Taking a direction reading when you are near a source of strong magnetism
can cause large errors in readings. Because of this, you should avoid taking
direction readings while in the vicinity of the following types of objects:
permanent magnets (magnetic necklaces, etc.), concentrations of metal
(metal doors, lockers, etc.), high tension wires, aerial wires, household
appliances (TVs, personal computers, washing machines, freezers, etc.).
• Accurate direction readings are impossible while in a train, boat, airplane,
etc.
• Accurate readings are also impossible indoors, especially inside ferro-
concrete structures. This is because the metal framework of such structures
picks up magnetism from appliances, etc.
Storage
• The precision of the bearing sensor may deteriorate if the watch becomes
magnetized. Because of this, you should be sure to store the watch away
from magnets or any other sources of strong magnetism, including:
permanent magnets (magnetic necklaces, etc.) and household appliances
(TVs, personal computers, washing machines, freezers, etc.)
• Whenever you suspect that the watch may have become magnetized,
perform one of the calibration procedures under “Calibrating the Bearing
Sensor” below.
More than 15
degrees too high
More than 15
degrees too low
Parallel to ground
Magnetic North
Direction
Value
12 o’clock
direction
Notes
• The auto-repeat on and off status indicators in the graphic area are not
shown in the countdown alarm display screen. To check whether auto-
repeat is on or off, perform step 1 of the above procedure to change to the
setting screen. Then you can check the status of the graphic area to see if
auto-repeat is on or off. After you are finished, press A to return to the
countdown alarm display screen.
• When the end of the countdown is reached and auto-repeat is turned on,
the alarm sounds, but the countdown starts again automatically whenever
the countdown reaches zero. You can stop timing by pressing C, and
manually reset to the starting countdown time by pressing A.
• Normally, an alarm tone sounds for 10 seconds when the end of the
countdown is reached. If you use auto-repeat with start time of 10 seconds
or less, the alarm tone sounds for only one second.