1997 Buick Park Avenue Owner's Manual - Page 113

Compass Variance I f a Variance is the difference between magnetic north and geographic north. In some areas, the difference between the two can be great enough to cause false compass readings. If this happens, follow these instructions to set the variance for your particular location: 1. Find your location on the zone map. Note your zone number. 2. Hold in the CAL switch (on the bottom of the mirror housing) for fiveseconds until the current zone entry number appears on the display. To hold in the CAL switch, insert a paper clip intothe small hole on the bottom of the mirror housing. 3. Repeatedly press the CAL switch until the number for the new zone entry is displayed. Once the desired zone number is displayed, stop pressing the CAL switch and the display will show compass direction within a few seconds. 2-53