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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.
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