1998 Cadillac Seville Owner's Manual - Page 110

3. Find your current location and variance zone number Compass Variance on the following zone map. The mirror is set in zone eight upon leaving factory. the It will be necessary to adjust the compass to compensate for compass variance if you live outside zone eight. Under certain circumstances, during a long distance as cross-country trip,it will be necessary to adjust for compass variance. Compass variance the difference is between earth's magnetic north and true geographic north. If not adjusted to account compass variance, for your compass could give false readings. To adjust for compass variance: 1. Use the COMPASS button located atthe bottom of the mirror. 2. Press and hold the COMPASS button until a zone number appears in display. the 4. Press the COMPASS buttonon the bottom of the mirror untilthe new zone number appears in the display. Afteryou stop pressing the button, the display will show a "C" and will need recalibration. 2-49