Patent ID: 7593813

Claim:
A navigation system for a motor vehicle, comprising: at least one storage device, at least one navigation map being stored on each of the at least one storage device; a reading device, each of the at least one storage device being read out by the reading device; a changeover device for the reading device, the changeover device exchanging the at least one storage device to be read out by the reading device; at least one display device for displaying at least one of a navigation map, a pictogram and information regarding an instantaneous position of the motor vehicle to a vehicle occupant; a control device for the changeover device to control the changeover device so that a point in time for changing over the at least one storage device is identifiable so that during a changeover operation of the at least one storage device, a deviation of the motor vehicle from a route segment currently being traveled is improbable based on current navigation data of the motor vehicle; wherein there is a changeover operation between data when the vehicle crosses a border of a navigation map, wherein it is certain that a vehicle position on a second digital map has been found and the route is determinable, and wherein from a navigation route of the motor vehicle identified by the navigation system, a turn-free route segment of the navigation route is determined, wherein from a length of the turn-free route segment and a maximum speed permissible for that route segment, a navigation time of the motor vehicle on the route segment is determined, and the ascertained navigation time of the motor vehicle is compared with a time required for a changeover operation of the storage device, and wherein the changeover operation is initiated when the ascertained navigation time is greater than the time required for the changeover operation.