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E-24
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 lower display will show an upward pointing arrow
(
) and the upper display will show -1-. These indicate that the
watch is ready for calibration of the fi rst direction.
E-25
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.
--- will be shown in the upper display while fi rst direction calibration is in progress. When
calibration is successful, OK will appear in the lower display for a short while, and then change
to
. The upper display will show -2-. These indicate 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.
--- will be displayed in the upper display while calibration is in progress.
After calibration is successful, the lower display will show OK and then the watch will start a digital
compass operation.
ERR will appear on the lower 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-26
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 lower display will show the current magnetic declination
direction, and the upper display will show the current magnetic
declination angle value.
Magnetic declination
direction (E, W, or OFF)
Magnetic declination
angle value
Magnetic declination
direction (E, W, or OFF)
Magnetic declination
angle value
E-27
3. Use
B
and
E
to change the magnetic declination direction and angle setting as required.
North Setting Setting
Magnetic North OFF, 0°
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 (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 1° West.
4. When the setting is the way you want, press
A
to exit the setting screen.
E-28
Using Bearing Memory
You can save the bearing to a particular destination in bearing memory and use it to ensure you are
headed in the correct direction.
To store a direction angle reading in Bearing Memory
1. Press
C
to start a digital compass operation (page E-20).
This will take an initial reading and then take readings every
second for 20 seconds.
If a bearing memory direction angle value is already displayed in
the lower display, it means that there is a reading already stored
in Bearing Memory. If this happens, press
E
to clear the Bearing
Memory reading and exit the bearing memory screen before
performing the above step.
2. During the 20 seconds that digital compass readings are being taken,
press
E
to store the current reading in Bearing Memory.
The watch will display the stored reading and start a digital
compass operation that lasts for about 20 seconds. The stored
bearing will be indicated in the digital meter during this time.
Pressing
E
will delete the current Bearing Memory contents (which
causes the bearing indication to disappear from the digital meter),
and start a new 20-second digital compass operation.
12 o’clock
position
Bearing
Memory
Pointer
North pointer
Direction angle
of current
reading
Bearing Memory Data
Bearing memory
direction angle value
12 o’clock
position
Bearing
Memory
Pointer
North pointer
Direction angle
of current
reading
Bearing Memory Data
Bearing memory
direction angle value
E-29
Bearing Memory Pointer
The digital meter indicates the bearing stored for a Bearing Memory record.
Bearing straight ahead
Bearing display area (Indicates a bearing within ±60° of 0.)
Bearing outside of display area (Bearing more than 60° left of 0.)
Bearing outside of display area (Bearing more than 60° right of 0.)
Bearing straight back
E-30
To position yourself to move in the direction of the recorded bearing, move around until the Bearing
Memory Pointer points straight ahead of you, as shown above.
Example: Advancing to an objective while monitoring your bearing
Even if you lose sight of your objective, you can use a map to store the required bearing in bearing
memory and refer to the memorized information to advance to your objective.
1. Set the map.
For information about how to set a map, see “Positioning a map in accordance with actual
surroundings (setting a map)” below.
2. Place the watch on the map at your current location, and point 12 o’clock at your desired objective on
the map.
3. Press
E
to store the direction to your objective in bearing memory. Now you can advance towards
your objective while observing the stored direction on the watch display.
Important!
As you progress, the direction to your bearing will change, so you need to keep updating the
information in bearing memory.
Positioning a map in accordance with actual surroundings (setting a map)
You can align a map with the northerly direction indicated by the watch, and then compare what is shown
on the map with your actual surroundings. This is helpful for checking your current location and the
location of your objective. This process is called “setting a map”.
When setting a map, be sure to align the watch with true north. See “Magnetic North and True North”
(page E-31) and “Magnetic Declination Correction” (page E-24).
E-31
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
Operation Guide 5415
4

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