1998 Oldsmobile 88 Owner's Manual - Page 104

When cleaning the mirror, use a paper towel or similar Do material dampened with glass cleaner. not spray glass cleaner directly on the mirror that may cause as the liquid cleaner to enter the mirror housing. Use a cotton swab and glass cleaner to clean photocells the when necessary. Mirror Operation Compass Operation Press the COMPASS switch once to turn the compass on or off. When the ignition and the compass feature are on,the compass will show two character boxes for approximately two seconds. After two seconds, the mirror will display compass heading. the If, after two seconds, display does not show a the compass heading ( " N ' for North, for example), there may be a strong magnetic field interfering with the compass. Such interference may be caused by a magnetic antenna mount, magnetic note pad holder or a similar magnetic item. Compass Variance The mirror is set in zone eight upon leaving the factory. It will be necessaryto adjust the compass to compensate for compass varianceif you live outside zoneeight. Under certain circumstances, during a long distance as The right side of the switch located at the bottomthe of cross-country trip,it will be necessary to adjust for off. mirror turnsthe electrochromic mirror on and To. compass variance. Compass variance is the difference turn on the automatic dimmingfeature, press MIRROR. between earth's magnetic north and true geographic To turn off automatic dimming, press MIRROR again. for north. If not adjusted to account compass variance, The green indicator light will be illuminated when this your compass could give false readings. feature is active. 2-45