GMC 1999 Suburban Owner's Manual page 115

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Compass Operation
Press the COMP switch once briefly to turn the compass
on or off.
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 compass heading.
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 the
liquid cleaner to enter the mirror housing.
Compass Calibration
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 be caused by a
magnetic antenna mount, magnetic note pad holder or a
similar magnetic item. If the letter "C" should ever
appear in the compass window, the mirror may need
calibration.
The mirror can be calibrated in one of two ways:
D
Drive the vehicle in circles at five mph (8 km/h) or
less until the display reads a direction, or
D
Drive the vehicle on your everyday routine.
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