1995 Pontiac Bonneville Owner's Manual - Page 118

The earth's magnetic fieldis not always the same direction as true north as we know it. So, you must enter a zone number to tell the compass the difference between magnetic and actual north. This tells the compass where in the country youare driving The compass shows the zone number use each time in you turn your key This is shown above. The number on. is turned off after a few seconds. The compass remembers your zone, so you only have to change it if you driveto a new zone on the map. The compass adjusts onlya small amount for each zone, so you may not notice a difference if you drive from one zone to the next one, until you cross several zones. Choosing your zone number: Locate your zone number on the map above. If your number is different than the one shown when you turn the key on, follow the steps to change your zone number.. If you live on the line, you can pick the zone area you are most likely to drive in. Alaska use Zone 9 OK 10. (In In Hawaii use Zone 7). 2--69