[54] NAVIGATION SYSTEM
[75] Inventors: Seiji Hayashi; Kihachi Hayashida;
Mitsuhiro Nimura; Yasunobu Ito, all
ol Anjo, Japan
[73] Assignee: Aisin AW Co., Ltd., Japan
[ * ] Notice: This patent issued on a continued prosecution application filed under 37 CFR 1.53(d), and is subject to the twenty year patent term provisions ol 35 U.S.C. 154(a)(2).
[21] Appl. No.: 08/739,709
[22] Filed: Oct. 29, 1996
[30] Foreign Application Priority Data
Oct. 30, 1995 [JP] Japan 7-281779
Apr. 26, 1996 [JP] Japan 8-108146
Apr. 26, 1996 [JP] Japan 8-108149
[51] Int. C I. G08G 1/123
[52] U.S. CI 340/995; 340/988; 340/990;
701/202; 701/209
[58] Field of Search 340/995, 990,
340/988; 345/123; 701/200, 201, 202, 205, 206, 209, 210, 211; 73/178 R
[56] References Cited
U.S. PATENT DOCUMENTS
4,737,916 4/1988 Ogawa et al 701/200
5,293,163 3/1994 Kakihara et al 349/995
5,371,497 12/1994 Nimura et al 340/995
5,396,431 3/1995 Shimizu et al 701/213
5,398,188 3/1995 Marayama 701/208
5,434,591 7/1995 Goto et al 345/123
5,471,392 11/1995 Yamashita 701/200
A navigation system provides road guidance by displaying information relating to roads on a structure shape map, together with landmark information, in such a manner that only information around the present position is highlighted. The system retrieves road information in the direction ol travel Irom the present position according to the vehicle speed, or road information within a predetermined angular or distance range in the direction ol travel. Information relating to roads includes information indicating a one-way road, information indicating a road into which entry is prohibited, and information indicating a pedestrian crossing and a railroad crossing. These items ol information are displayed by using marks, and the landmark information is displayed by using landmarks, thereby displaying information necessary for travel in a readily perceivable manner according to the travel conditions. When the vehicle enters a parking lot in the middle ol the guidance for a route to a destination, the system searches for a route from the parking lot to the destination and outputs the found route by using a structure-shape map. The parking lot in this case is one within a predetermined walking distance from the destination. II the parking lot is in close proximity ol the destination, frxrther guidance is not necessary and the guidance is terminated.
36 Claims, 16 Drawing Sheets
