Patent ID: 7194355
Filing Date: 2007-03-20
Classification: G01C

Abstract:
1. A navigation system comprising: a road map data storage for storing map data including road attribute data; a route calculation unit for calculating a route from a current position to a destination by using the map data stored in the road map data storage unit, wherein the route includes a road to be followed from the current position; a route guidance unit for performing a route guidance to the destination in accordance with the route calculated by the route calculation unit; and a change unit for changing a distance of the road to be followed included in the route according to a road attribute of the road to be followed, wherein the road attribute is included in the road attribute data stored in the road map data storage unit, wherein, when the route calculation unit sets a branch point for branching to another road from the road to be followed, the branch point is set after the distance is exceeded.