A motor vehicle computer system with an anti-theft detachable front plate and method for operating it

A motor vehicle computer system is arranged for running vehicle-associated computer programs, such including a vehicle navigation program. The system comprises a vehicle-associated base station (1) in engagement with a detachable front plate (2) which is anti-theft designed with respect to a part or the whole of said base station. The front plate comprises data oriented facilities that with the front plate thus being engaged, cooperate with the base station's data processing system. On the other hand, the data oriented facilities are arranged for in a detached state fulfilling a stand-alone data storage function (9). Also, the front plate has a communication facility (7) for hardwired attachment to an out-of-vehicle computer facility (22). In particular, the computer system is arranged for running the vehicle navigation program on the basis of route data stored in the data storage facility (9) after generating thereof through executing a route planning program (36) in the out-of-vehicle computer facility (22).