Abstract: A deviant position detector that determines whether or not a vehicle deviated from a set route, detects route deviation information such as a route deviated position when a vehicle deviated, and stores it as past route deviation information in a route deviant position memory. A route searching device searches a route to a destination based on information obtained by a position detector and a map information acquiring device, and further searches past route deviation information obtained from the route deviant position memory. A route guidance changing device determines whichever route guidance method is the best based on information obtained by the route searching device and from the route deviant position memory, and instructs a route guidance outputting device to output the best route guidance method.

Abstract: There is disclosed a navigation device designed to display emphasis display data edited by an emphasis display data editing part and normal display data edited by a normal display data editing part in a superposing manner. Thus, a clear visible map can be displayed.

Abstract: Deviant position determining means determines whether or not a vehicle deviated from a set route, detects route deviation information such as a route deviated position when a vehicle deviated, and stores it as past route deviation information in route deviant position storing means. The route searching means searches a route to the destination based on information obtained by position detecting means and map information acquiring means, and past route deviation information obtained from the route deviant position storing means. The route guidance changing means determines whichever route guidance method is the best based on information obtained by the route searching means and from the route deviant position storing means, and instructs a route guidance outputting means.

Abstract: There is disclosed a navigation device designed to display emphasis display data edited by an emphasis display data editing part and normal display data edited by a normal display data editing part in a superposing manner. Thus, a clear visible map can be displayed.

Abstract: A traffic information display device including a current position detecting unit for detecting the current position of a vehicle in which the traffic information display device is mounted, a road map storing unit for storing road map data, a map display control unit for displaying a road map image associated with an area in the vicinity of the current position of the vehicle on the screen of a display device on the basis of the current position from the current position detecting unit and road map data from the road map storing unit, a traffic information receiving unit for receiving traffic information, a traffic information display control unit for displaying traffic information from the traffic information receiving unit on the road map image displayed on the screen of the display device, and a traffic information display restricting unit for restricting a display of traffic information about a predetermined area of the on-screen road map image so as to emphasize traffic information about the remaining are