2005 Pontiac Grand Prix Owner's 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. 3-63