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Casio 5441 Handleiding

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E-24
• Any ongoing digital compass operation is paused temporarily while the watch is performing an alert
operation (daily alarm, Hourly Time Signal, countdown timer alarm) or while illumination is turned on (by
pressing
B
). The digital compass operation resumes for its remaining duration after the operation that
caused it to pause is fi nished.
• See “Digital Compass Precautions” (page E-29) for important information about taking direction readings.
• The direction indicated by the Digital Compass is magnetic north.
You can use Magnetic Declination Correction to confi gure the watch to indicate true north, if you want.
For details, see “Magnetic Declination Correction” below, “To perform magnetic declination correction”
(page E-27), and “Magnetic North and True North” (page E-29).
Calibrating the Bearing Sensor
You should calibrate the bearing sensor whenever you feel that the direction readings being produced by
the watch are off. You can use any one of two different bearing sensor calibration methods: bidirectional
calibration or magnetic declination correction.
•
Bidirectional Calibration
Bidirectional calibration calibrates the bearing sensor in relation to magnetic north. Use bidirectional
calibration when you want to take readings within an area exposed to magnetic force. This type of
calibration should be used if the watch becomes magnetized for any reason.
Important!
• To ensure correct direction readings by the digital compass, be sure to perform bidirectional calibration
before using it. The digital compass may produce incorrect direction readings if you do not perform
bidirectional calibration.
E-25
•
Magnetic Declination Correction
With magnetic declination correction, you select a declination angle direction and input a magnetic
declination angle (difference between magnetic north and true north), which allows the watch to indicate
true north. You can perform this procedure when the magnetic declination angle is indicated on the map
you are using.
Precautions about bidirectional calibration
• You can use any two opposing directions for bidirectional calibration. You must, however, make sure
that they are 180 degrees opposite each other. Remember that if you perform the procedure
incorrectly, you will get wrong bearing sensor readings.
• Do not move the watch while calibration of either direction is in progress.
• You should perform bidirectional calibration in an environment that is the same as that where you plan
to be taking direction readings. If you plan to take direction readings in an open fi eld, for example,
calibrate in an open fi eld.
To perform bidirectional calibration
1. In the Digital Compass Mode, hold down
A
.
• The second hand will move to 12 o’clock, indicating the
bidirectional calibration mode.
• At this time, the upper display will shows an upward pointing arrow
(
) and the lower display will show 1, indicating that the watch is
ready for calibration of the fi rst direction.
E-26
2. Place the watch on a level surface facing any direction you want, and press
C
.
• This will start calibration of the fi rst direction.
• --- is shown on the lower display while calibration is being performed.
• When calibration of the fi rst direction is successful, OK appears in the upper display and the
arrow changes to downward pointing (
). The lower display will show 2, indicating that the watch
is ready for calibration of the second direction.
3. Rotate the watch 180 degrees.
4. Press
C
again.
• This will start calibration of the second direction.
•
---
is shown on the lower display while calibration is being performed.
• After calibration is successful,
OK
appears in the upper display and the arrow changes to downward
pointing (
).
• ERR will appear on the upper display for a short while if an error occurs. After that, the screen will
automatically return to the fi rst direction calibration screen (the one that appears after
A
is held
down in step 1).
E-27
To perform magnetic declination correction
1. In the Digital Compass Mode, hold down
A
.
• The second hand will move to 12 o’clock, indicating the
bidirectional calibration mode.
2. Press
D
.
• The watch will enter the magnetic declination correction mode.
• The upper display will show the magnetic declination direction (E,
W) and angle.
Magnetic declination
direction (E, W) and angle
Magnetic declination
direction (E, W) and angle
E-28
3. Use
B
and
E
to change the magnetic declination direction and angle setting as required.
North Setting Setting
Magnetic North 0° (OFF)
True North
E 90° to W 90°
E: East declination (Magnetic north is east of true north.)
W: West declination (Magnetic north is west of true north.)
• Note that you can input the declination angle in whole degree units only, so you may need to round
off the value specifi ed on the map. If your map indicates the declination angle as 7.4°, you should
input 7°. In the case of 7.6° input 8°, for 7.5° you can input 7° or 8°.
• Holding down
B
or
E
will scroll the setting at high speed.
• You can turn off (0° (OFF)) magnetic declination correction by pressing
B
and
E
at the same
time.
• The illustration, for example, shows the value you should input and the direction setting you should
select when the map shows a magnetic declination of 7° West.
4. When the setting is the way you want, press
A
to exit the setting screen.
E-29
Digital Compass Precautions
Magnetic North and True North
The northerly direction can be expressed either as magnetic north or true
north, which are different from each other. Also, it is important to keep in mind
that magnetic north moves over time.
• Magnetic north is the north that is indicated by the needle of a compass.
• True north, which is the location of the North Pole of the Earth’s axis, is the
north that is normally indicated on maps.
• The difference between magnetic north and true north is called the
“declination”. The closer you get to the North Pole, the greater the
declination angle.
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 readings are also impossible indoors, especially inside ferroconcrete structures. This is
because the metal framework of such structures picks up magnetism from appliances, etc.
• Accurate direction readings are impossible while in a train, boat, air plane, etc.
True north
Earth
Magnetic north
True north
Earth
Magnetic north
E-30
Storage
• The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of
this, you should store the watch away from magnets or any other sources of strong magnetism,
including: permanent magnets (magnetic necklaces, etc.), concentrations of metal (metal doors,
lockers, etc.), and household appliances (TVs, personal computers, washing machines, freezers, etc.)
• Whenever you suspect that the watch may have become magnetized, perform the procedure under “To
perform bidirectional calibration” (page E-25).
E-31
Taking Temperature Readings
This watch uses a temperature sensor to measure temperature.
To take temperature readings
While in the Timekeeping Mode, press
E
.
•
TEMP
will appear in the upper display and temperature measurement
will start. After about one second, the measurement reading will
appear in the upper display.
• The watch will continue to take temperature readings every fi ve
seconds for about two minutes.
• The watch will return to the Timekeeping Mode after the reading
operation is complete (about two minutes).
• Press
E
to restart temperature readings.
• Pressing
D
while a reading operation is in progress will stop the
operation and enter the Timekeeping Mode.
Temperature
• Temperature is displayed in units of 0.1°C (or 0.2°F).
• The displayed temperature value changes to
- - -
°C (or °F) if a measured temperature falls outside the
range of –10.0°C to 60.0°C (14.0°F to 140.0°F). The temperature value will reappear as soon as the
measured temperature is within the allowable range.
TemperatureTemperature
Operation Guide 5441
4

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