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Compass Operation
Compass Variance
When the ignition is on and the mirror switch is in the
C/M position, the compass display will show two
character boxes for approximately two seconds. If, after
two seconds, the display does not show a compass
heading ("N" for North, for example), there may be a
strong magnetic field interfering with the compass. Such
interference may include magnetic antenna mounts, a
magnetic note pad holder, or a similar magnetic item. If
removing these items does not correct the condition, see
your GM dealer for assistance.
When cleaning the mirror, use a paper towel or similar
material dampened with glass cleaner.
Do
not spray
glass cleaner directly on the mirror as that may cause
liquid cleaner to enter the mirror housing.
Under certain circumstances, as during
a
long distance
cross-country trip, it will be necessary to adjust the
compass to compensate for compass variance. Compass
variance is the difference between earth's magnetic
North and true geographic North. If not adjusted to
account for compass variance, your compass could give
false readings.
To adjust for compass variance:
1.
Use the CAL switch located at the bottom of the
mirror housing near the on/off switch. A safety pin
or a paper clip can be used to press the button. Press
and hold the CAL switch for five seconds until a
zone number appears in the display.
2. Find your current location and variance zone number
on the following zone map.
2-40
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