Oldsmobile 2001 Silhouette - Manual (Page 208)

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Compass Variance
Compass variance is the difference between magnetic
north and geographic north. In some areas of the
country, the difference is great enough to cause
the compass to give false readings. If this occurs,
the compass variance must be set.
Setting the Variance
Turn the ignition on and cycle the DIC to the
compass/temperature mode. Press both the E/M and
MODE buttons simultaneously for approximately
five seconds. The last entered variance zone number
will be displayed. Press the E/M button until the
proper variance number, as shown on the map, is
showing. Press the MODE button to set the new
variance zone and resume normal operation.
The display will show all the display segments briefly
to acknowledge the change in the zone number.
Automatic Compass Calibration
The compass is self - calibrating, which eliminates the need
to manually set the compass. When the vehicle is new,
the calibration process may not be complete. In these
cases the calibration symbol “C” will be displayed
where the compass reading is normally displayed.
To calibrate the compass, in an area free from large metal
objects, make three 360
_ turns. The calibration symbol
will turn off and the compass reading will be displayed.