GM Service Manual Online
For 1990-2009 cars only

Inappropriate route guidance can occur under one or more of the following conditions:

    • You have not turned onto the road indicated.
    • Route guidance may not be available when using automatic rerouting for the next right or left turn.
    • The route may not be changed when using automatic rerouting.
    • There is no route guidance when turning at an intersection.
    • Plural names of places may be announced occasionally.
    • It may take a long time to operate automatic rerouting during high-speed driving.
    • Automatic rerouting may display a route returning to the set waypoint if you are heading for a destination without passing through a set waypoint.
    • The route prohibits the entry of a vehicle due to a regulation by time or season or any other regulation which may be given.
    • Some routes may not be searched.
    • The route to the destination may not be shown if there are new roads, if roads have recently changed or if certain roads are not listed on the map DVD. See Ordering Map DVDs .

To recalibrate the vehicle's position on the map, see Navigation Set Up .