1998 Cadillac DeVille Owner's Manual - Page 122

Compass Variance The mirror is set in zone eight upon leaving the factory. It will be necessary adjust the compass to compensate to for compass variance if live outside zone eight. you as Under certain circumstances, during a long distance cross-country trip, it will be necessary to adjustfor compass variance. Compass variance the difference is between earth's magnetic north and geographic true for north. If not adjusted to account compass variance, false readings. your compass could give To adjust for compass variance: 1. Use the COMPASS button located atthe bottom of the mirror. 2. Press and hold the COMPASS button until zone a number appearsin the display. 3. Find your current location and variance zone number on the following zone map. 4. Press the COMPASS button on the bottom the of in mirror until the new zone number appears the the display. After you stop pressing the button, display will show a "C" in the direction display within a few seconds. (This is the automatic calibration mode -- you'll need to drive ina circle to calibrate the mirror. See "Compass Calibration" following.) 2-51