1998 Pontiac Bonneville Owner's Manual - Page 137

The earth's magnetic field is not always the same direction as true north as we know it. So, you must enter a zone numberto tell the compass the difference This between magnetic and actual north. tells the compass wherein the country youare driving. The compass shows the zone numberuse each time in is The you turn your key on. This above the compass. off number is turned after a few seconds. The compass remembers your zone, you only have to so on change it if you drive to a new zone the map. The compass adjustsonly a small amountfor each zone, so you may not notice a difference if you drive from one zone to the next one, until cross several zones. you Choosing Your Zone Number Locate your zone number on the previous map. your If number is Merent than the oneshown when you turn the key on, follow the steps to change your zone number. If you live on the line, youcan pick the zone area you are most likely to drive in. (In Alaska use Zone 10. 9 or In Hawaii use Zone 7). 2-80