For the purpose of making available route data for a navigational device, an overall route is divided up into route segments which each include a part of the overall route. A first route segment is transmitted to the navigational device, upon its request, which around the starting point includes a starting...http://www.google.com/patents/US7110879?utm_source=gb-gplus-sharePatent US7110879 - Method for making available route data for a navigational device
