| 摘要 |
PROBLEM TO BE SOLVED: To provide a navigation system and a computer program capable of making a user to accurately grasp timing to enter a tunnel and timing to exit from the tunnel. SOLUTION: In the case of the presence of a link having a tunnel attribute in a map graphic area graphically drawn on a liquid crystal display 17, the link is specified as having a junction of a link corresponding to an entrance of a tunnel. The traveling direction of a vehicle at the entrance of the tunnel is specified on the basis of an angle of connection of each link at the junction. The position of the entrance of a specified tunnel and a tunnel mark for guiding the user about the traveling direction of the vehicle at the entrance of the tunnel are graphically drawn on the liquid crystal display 17. COPYRIGHT: (C)2009,JPO&INPIT |
