A vehicle tracking system, wherein with respect to vehicles owned by members on which communication units containing GPS receivers are mounted, the vehicle tracking system specifies a previously-registered member and the vehicle owned by the previously-registered member based upon a request of the previously-registered...http://www.google.de/patents/US6611229?utm_source=gb-gplus-sharePatent US6611229 - Vehicle tracking system, vehicle-theft warning system, stolen-vehicle tracking system, and theft-warning vehicle tracking system
