Patent ID: 8010227
Filing Date: 2011-08-30
Classification: G01C,G06F

Abstract:
1. A method of operation for a navigation system that includes a server and a mobile unit located remotely from the server, wherein the navigation system uses geographic data which is organized into groupings based on a plurality of map tiles, wherein each of the map tiles corresponds to a separate one of a plurality of geographic areas into which a geographic region is divided, the method comprising: on the mobile unit, continuing to determine a current position of the mobile unit; accepting from a user of the mobile unit a destination; transmitting the current position and the destination from the mobile unit to the server; receiving from the server a set of map tiles and tile exit points associated with a route calculated by the server using the transmitted current position and destination; on the mobile unit, calculating a first route from a new current position to a first tile exit point using the data corresponding to a first map tile from the set of received map tiles; and as the mobile unit progresses toward the destination, calculating a subsequent route from a subsequent new current position to a next tile exit point.