A stop area is set in an arbitrary area where map matching processing is to be stopped, by an operation switch group or a remote controller. When a vehicle enters the stop area, the map matching processing is stopped, and when the vehicle exits from the stop area, the map matching processing is performed....http://www.google.com/patents/US7346450?utm_source=gb-gplus-sharePatent US7346450 - Vehicle navigation apparatus for controlling map-matching areas
