1996 Cadillac Seville Owner's Manual - Page 109

Compass Variance Variance is the difference between magnetic north and geographic north. In some areas, the difference between the two can be great enoughto cause false compass readings. If this happens,follow these instructionsto set the variance for your particular location: 1. Find your location on the zone map. Note the zone number. 2. Hold in the CAL'switch (on the bottom of the mirror housing) for five seconds until the current zone entry number appears in the display. To hold in the CAL switch, insert a paperclip into the small hole on the bottom of the mirrorhousing. 3. Press the CAL switch until the numberfor the new zone entry is displayed. Once the desired zone number displayed, stop is pressing the CAL switch and the display will show compass direction within afew seconds. 2-50