1996 Pontiac Bonneville Owner's Manual - Page 135

Compass Accuracy Your compass may show different headings around bridges, power lines, large metal objects steep hills. and This is normal and is trueof compasses in general. If yhu -put large metal objects golf clubs in the trunk like they could affect accuracy. the accuracyis close, the If compass will adapt to these objects over time. If you use ah antenna witha magnetic base, it best is to mountit away from the centerof the trunk near the . ,,- ST rear window. , , . A The rear defog system can affect accuracy, the and compass corrects for the reatdefog. However, if the rear defbg is turned on while makingsharp turns, the accuracy may be off. When you hun the rear defog off .' again, the accuracy returns normal. to ' - .Do not t r on the r e s defog if you are trying to un calibrate. Thesystemwill not allowthe calibration. You will hear the chime, and CALIBRATE will flash for a few seconds. Be awarethat metal objects are sometimes buriedthe in ground. They can affect accuracy you may not know and they are there. an example, many concrete roads As have metal reinforcements inside. ,>,L".{. ~ ,_..-. I, ~ , .>t ._ , -5...I->- ' . : I e . .. , I , I ,"E . . I .Lt ' 5 : i ' I 2-84