Patent ID: 8554474
Filing Date: 2013-10-08
Classification: G01C

Abstract:
1. A method for updating navigation map data, comprising using mobile communications to receive navigation map update data from a plurality of navigation units each carried by a corresponding one of a plurality of vehicles, the navigation map update data being obtained by; detecting a position of each vehicle via operation of a respective navigation unit; calculating a route for each vehicle to a destination via operation of the respective navigation unit using the navigation map data; detecting when the calculated route to the destination is left by each vehicle via operation of the respective navigation unit, and then storing position data of the vehicle in a memory of the vehicle's navigation unit until: evaluating the position data stored by the respective navigation units of the plurality of vehicles to obtain the navigation map update data after a number of the plurality of vehicles that left the calculated route exceeds a threshold value; wherein storing the position data and evaluating the position data includes filtering out position data corresponding to detours for fuel stations, restaurants visits, and other events associated with prolonged periods of the navigation unit being stationary.