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 HOW
TO COMPENSATE FOR COMPASS DEVIATION
Compass Deviation is the deflection of the compass from a position
of magnetic north by magnetic fields created by metal in the vehicle.
The circuitry for the Field Compass incorporates a compass deviation
correction feature that will reduce the amount of compass deviation.
However, in order to set the correction feature, the compass must
be calibrated using the procedures outlined below.
| 1. |
The vehicle must be located in a clear area where it is possible
to perform a 360 degree turn in a period of 2 minutes. The area
should be away from objects that create high magnetic fields,
such as power transmission lines. |
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| 2. |
Set the compass to the North Bearing Mode using the MODE switch.
Enter the magnetic correction mode by pressing the SET switch
for more than 2 seconds. |
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| 3. |
Drive the vehicle in a full circle(see diagram below). When
the compass has completed the calibration readings, it will
automatically return to the North Bearing Mode. |
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| 4. |
If the compass does not complete the determination of the
correction within two minutes, the compass will revert to the
prior deviation correction. |
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NOTE: If there is no location where the vehicle
can turn in a circle, the correction can be made by maneuvering
the vehicle in a series of 90 degree turns. Do not perform these
maneuvers where there is traffic or where making such maneuvers
would be illegal. |
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NOTE
ABOUT MAGNETIC COMPENSATION
| 1. |
If the deviation correction procedure cannot be completed
within a 2 minute period, press the SET switch for more than
2 seconds and previously recorded data will be restored. |
| 2. |
Make sure that the vehicle is not moving before setting the
unit control to perform the correction procedure. |
| 3. |
When beginning and ending the deviation correction procedure,
make sure that the vehicle's wheels are aligned to turn both
on initiation and completion of the procedure. |
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SETTING
THE DESIRED BEARING
| 1. |
Select compass desired bearing mode using the MODE switch.
Press the SET switch for more than 2 seconds to enter into desired
set mode. The compass circle indicator light will flash. |
| 2. |
The desired bearing can be selected by pressing the MODE switch. |
| 3. |
Press the MODE switch for more than 2 seconds to complete
the setting. The bearing display will resume. |
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| SETTING
VARIANCE MODE |
In Auto-North Mode (16 point display, 8 point display), if the
Mode and SET switches are pressed simultaneously for more than 2 seconds,
the variance mode will be selected.
If the Mode switch is pressed once, the calibration values will change
as follows:
0E and 0W calibration values are the same, previous setting values
are also displayed. If the SET switch is pressed for more than 2 seconds,
the latest value is recorded in E2 PROM memory. When Setting Variance
mode is finished, the display will return to normal mode.
The pointer points up and the circle flashes at 2Hz.
NOTE: Variance refers to the difference between true north and magnetic
north.
The diagram below shows an example variance of 20oW.
If the vehicle turns to the north on the map and the calibration value
is zero( 0 ), NNE (difference of 22.5o) is displayed. However, this
value is calibrated to read N.
If the calibration is set to 20o W, 20o is offset to the W according
to the direction the sensor is reading. |
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PROBLEM
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CHECK THE FOLLOWING
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| There is no display. |
*Are all the wires connected properly?
*Are the connections working properly?
*Is the fuse burned out?
*Is the vehicle ignition turned on?
*Is the cigarette plug properly connected?
*Is the power 12V connected to the cigarette plug when the key
is switched ON? |
| Strange values are displayed. |
*Are all the wires connected properly?
*Are all connections attached properly?
*Are all sensors attached properly? |
| Strange values are displayed and the instrument
fails to function properly. |
*It is possible that the computer inside the product
may be malfunctioning due to a radio frequency interference
in your vehicle. Restart the vehicle and check its operation
again. |
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End
of Life Products |
