The road network of Europe and Russia is changing all the time. It is important to have the latest available maps in your Toyota Navigation System to keep operation at peak performance!
The Toyota Prius navigation system works by using the car's internal GPS signal in combination with a region map information DVD. The GPS determines the coordinates of the car, then the map DVD associates them with the street, area and point of interest information. The map navigation DVD is what makes it possible to get turn-by-turn driving directions.
Because of road closures, constructions or changes in street names, this map information DVD should be updated yearly to maintain maximum accuracy of the Prius vehicle's navigation system.