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Operation Guide 2891
7
Your watch uses a built-in magnetic sensor to detect and display direction. You can use displayed data to determine the direction to an
objective or your current bearing.
• If you have reason to suspect that direction readings are not correct, you can calibrate the direction sensor using the procedure under
“Calibrating the Direction Sensor”.
Interpreting the Degree Value
About two seconds after you press the A button , the watch
enters the Compass Mode and displays the direction angle
and graphic pointers.
Taking a direction reading with the digital compass causes
readings to be taken each second for 20 seconds.
After the direction reading operation is complete, you can press
the A button again to restart it.
• An alarm or other beeper operation or turning on illumination by
pressing the L button while a direction reading operation is in
progress will stop it momentarily. The direction reading operation
will resume when the beeper or light operation is complete.
• Taking a direction reading in a location where terrestrial
magnetism is weak can affect direction readings.
• The full auto light switch is disabled during the 20 seconds
required to take a direction reading with the digital compass.
• After the direction reading operation is complete, press the D
button to return to the Timekeeping Mode.
If you do not perform any button operation for two or three
minutes while in the Compass Mode, the watch will return to
the Timekeeping Mode automatically.
When 12 o’clock is
pointing northwest
()
Digital Compass Precautions
Note the following points whenever taking a direction reading with the digital compass.
❚
When taking a reading
Orient the watch so it is level, either on your wrist of off your wrist.
• Orienting the watch at an angle can cause large measurement
error.
High-voltage power lines
Electric household appliances
(TV, computer, speakers, etc.)
Permanent magnets
(magnetic necklaces, etc.)
Metal
(steel columns, lockers, etc.)
❚
Location
The wrong type of location can cause large measurement error.
Avoid the following types of locations when taking a direction
reading with the digital compass.
Near objects that generate strong magnetic force
• Move as far away from magnetic items as possible.
Inside a motor vehicle or indoors
(ferro-concrete structures, in particular)
• Accurate direction readings are not possible under these
conditions.
• Performing 2-point calibration makes it possible to obtain
relatively accurate direction readings while in a motor vehicle or
any other vehicle that can freely change direction. See “To
perform 2-point calibration” and “Using the Compass in an
Automobile” for more information.
Indoors (steel is magnetic)
Automobiles
Trains
Boats, aircraft
❚
Storage location
Keep the watch away from magnets and any other sources of
strong magnetism.
If the watch is exposed to magnetism
Exposing the watch to magnetism can affect the accuracy of its
digital compass readings. If this happens, perform 2-point
calibration (“To perform 2-point calibration”) to correct the
readings.
• If you are unsure if you watch has been exposed to
magnetism, perform 2-point calibration before taking a
direction reading.
• Exposing the watch to extremely strong magnetism can
make correct direction readings impossible even after
2-point calibration, or can cause display of abnormal values
during direction readings.
Permanent magnets
(magnetic necklaces, bag clasps, etc.)
Electric household appliances
(TV, speakers, etc.)
Calibrating the Direction Sensor
Perform one of the calibration operations described below whenever you think that the watch’s direction readings are not correct for some
reason.
• The watch will exit the flashing digital compass screen automatically if you do not perform any operation for two or three minutes.
Tips for 2-Point Calibration
The more carefully you perform 2-point calibration, the more accurate subsequent direction readings will be. If the environment where you
are using the watch changes, after you have not used the watch for some time, or any other time you feel that direction readings are not
correct, perform 2-point calibration again.
• Perform 2-point calibration in the location and under the conditions where you will be using the watch to take direction readings. If you plan
to take readings on an open field, perform calibration there, if you plan to take readings in a motor vehicle, perform calibration in the vehicle.
• You can use any two directions when performing 2-point calibration. Just make sure that the second point is exactly 180 degrees opposite
from the first point.
• When performing 2-point calibration inside an automobile or boat, turn the automobile or boat around 180 degrees when changing direction.
Northerly Calibration
With northerly calibration, you “teach” the direction sensor the
northerly direction (determined using another compass, etc.)
Northerly calibration also can be used to calibrate the direction
sensor to correct the declination angle and indicate true north,
rather than magnetic north.
• If you want to perform both 2-point calibration and northerly
calibration, perform 2-point calibration first and then
northerly calibration. Performing 2-point calibration
automatically cancels the last northerly calibration setting.
2-Point Calibration
Use 2-point calibration to calibrate the direction sensor to suit
a particular magnetic environment.
Before using the watch inside of an automobile, for
example, perform 2-point calibration to correct for the
effects of magnetism that may be present in the vehicle.
Taking Direction Readings
❚
To take a direction reading
In the Timekeeping Mode, Pressure/Temperature Mode, or Altitude Mode,
orient the watch so it is level (either on your wrist or off your wrist).
Pointing 12 o’clock in the direction you want to read, press
the
AA
AA
A button.
Compass
Direction you want to read
East
West North
South
Flashes during
direction reading
Direction
Indication
in Degrees
The direction indicated by the watch is
accurate up to ±11 degrees.
Example: When 12 o’clock is pointing
northwest
Northwest (315
o
) = 304
o
to 326
o