Pontiac 2005 Grand Prix - Manual (Page 169)

Setting the Compass
The compass is self-calibrating, which eliminates the
need to manually set the compass.
However, under certain circumstances, such as during a
long distance cross-country trip, it will be necessary
to compensate for compass variance and reset the zone
through the DIC.
Compass variance is the difference between the earth’s
magnetic north and true geographic north. If not
adjusted to account for compass variance, the compass
in the vehicle could give false readings.
In order to do this, the compass must be set or
calibrated to the variance zone in which the vehicle is
travelling.
To adjust for compass variance, use the following
procedure:
1. Find the vehicle’s current location and variance
zone number on the map.
2. Press the set/reset button to scroll through and
select the appropriate variance zone.
3. Press the options button to advance to the
calibration screen.
4. Drive the vehicle in a circle two times to activate
the compass.
The direction the vehicle is moving will be displayed in
the bottom left corner of the screen, and will appear
in the gages, fuel, trip, and some of the options modes.
Press the options button again to advance to the
next screen.
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