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Compass Operation
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 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.
Compass Variance
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. Press and hold the CAL switch, located at the bottom
of the mirror
housing, 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.
2-53
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