2011 Buick Lucern Owner's Manual - Page 136

Compass Compass Operation There is a compass display in the upper right corner of the mirror. To adjust for compass variance: 1. Find your current location and variance zone number on the following zone map. Compass Calibration Press and hold O to activate the compass calibration mode. CAL displays in the compass window on the mirror. If after a few seconds the display does not show a compass direction, (N for North for example), there may be a strong magnetic field interfering with the compass. Interference can be caused by a magnetic antenna mount, note pad holder, or similar object. If CAL displays in the compass window, the compass may need to be reset or calibrated. The compass can be calibrated by driving the vehicle in circles at 5 mph (8 km/h) or less until the display reads a direction. Compass Variance The compass is set to zone eight. If you do not live in zone eight or drive out of the area, the compass variance needs to be changed to the appropriate zone. 2. Press and hold O until the zone number displays. The number shown is the current zone number. 3-32