Chevrolet Corvette Owner's Manual page 109

Map Lamps
The mirror has map lamps located at the bottom
of the mirror. To manually turn the lamps on or off,
press the button next to each lamp.
Compass Operation
The mirror has an eight-point compass display in
the bottom of the mirror face.
When the ignition and the compass feature are
on, the compass will show two character boxes for
approximately two seconds. After two seconds,
the mirror will display the current compass
heading. For example, NE is displayed for
north-east.
Compass Calibration
If after two seconds the display does not show a
compass heading, there may be a strong magnetic
field interfering with the compass. Such
interference may be caused by a magnetic
antenna mount, note pad holder or similar object.
If the letter C appears in the compass window,
the compass needs calibration.
The mirror compass can be calibrated by driving
the vehicle in circles at 5 mph (8 km/h) or less until
the display reads a direction.
The compass can be placed in calibration mode
by pressing and holding the left map light
button until a C appears on the compass display.
Compass Variance
Compass variance is the difference between
earth's magnetic north and true geographic north.
If the mirror is not adjusted for compass
variance, your compass could give false readings.
The mirror is set in zone eight upon leaving the
factory. It will be necessary to adjust the compass
to compensate for compass variance if you live
outside zone eight. Under certain circumstances,
such as a long distance, cross-country trip, it
will be necessary to adjust the compass variance.
I n f o r ma t i o n P r o v i d e d b y :
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