1993 Pontiac Bonneville Owner's Manual - Page 114

I (OPTION) Calibrating the Compass The compass should be calibrated On some vehicles, an electronic according to the proper Zone Setting: compass comes on when you start the engine. As with all compasses, it senses At least once a year. magnetic north to determine direction. Any time it displays the word But magnetic north is not located at the CALIBRATE. same place as true north, so a zone Any time it seems to showincorrect value is used to improve accuracy. directions. Setting Up Your Compass Consists of Two Steps: 1. Calibrating the compass to magnetic north. 2. Setting the zoneso the compass points to true north. Electronic Compass Calibrating to Magnetic North: 1. Drive to an open area such as a large, empty parking lot. Be sure the area is not only freeof other vehicles but also away from power lines or large metal objects. 2. Push and hold MODE for more than six seconds. After three seconds, CALIBRATE and the heading display will go off. ZONE and the zone number will be displayed. After six seconds, CALIBRATE will flash and the heading display will rotate. ZONE and the zone number will go blank. Release theMODE button. 113 . '