Patent ID: 7302342

Claim:
A navigation apparatus in a vehicle, comprising: a position detector configured to facilitate detecting a current position of the vehicle; an advancing direction detecting unit configured to facilitate detecting an advancing direction of the vehicle; a road data storage unit configured to facilitate storing road data, where a road includes at least one link, each link assigned information indicating a position of the each link, wherein a link corresponding to a one-way traffic road is assigned one-way traffic information including a trafficable direction; a map matching unit configured to facilitate extracting a link within an area surrounding the detected current position from the road data storage unit to designate a travel road that the vehicle travels from a map-matching candidate road that includes the extracted link, wherein a certain road including the extracted link is excluded from the map-matching candidate road when the extracted link included in the certain road is assigned one-way traffic information indicating a trafficable direction not agreeing with the detected advancing direction; and a registering unit configured to facilitate executing registration to register a one-way traffic road temporarily used in a direction opposite to a trafficable direction, wherein the map matching unit is configured to facilitate regarding a link included in the registered one-way traffic road as a link assigned no one-way traffic information.