The Audi Navigation System depends upon signals from the worldwide Global Positioning Satellite network. The vehicle's electrical system, and existing wireless and satellite technologies, must be available and operating properly for the system to function. The system is designed to provide you with suggested routes in locating addresses, destinations and other points of interest. Changes in street names, construction zones, traffic flow, points of interest or other road system changes are beyond the control of Audi of America, Inc. or Audi Canada. Complete detailed mapping of lanes, roads, streets, toll roads, highways, etc., is not possible, therefore you may encounter discrepancies between the mapping and your actual location. Please rely on your individual judgment in determining whether or not to follow a suggested Audi Navigation System route. Periodically the mapping is updated and a new DVD will be required in order to maintain the latest navigation information available to us. These will be available for purchase at additional cost.