1995 Buick Park Avenue Owner's Manual - Page 105

Compass Variance 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 five secondsuntil the currentzone 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. Variance is the difference between magnetic north and geographic north. In some areas the difference between the two can be greatenough to cause falsecompass readings. If this happens, follow these instructions to set the variance for your particular location: 2-47