05515284 is referenced by 58 patents and cites 17 patents.

A storage medium for map information for a navigation system includes an IC memory chip or an IC memory card of a small memory capacity. This storage medium stores detailed map information of a limited region including part of a highway network and information of the highway network covering a predetermined area which includes the limited region and is wider than the limited region. A system for offering map information for a navigation system includes two storage media. One storage medium is the same as the above-mentioned storage medium and the other storage medium has a small memory capacity. The other storage medium stores detailed map information of a limited region different from the limited region whose information is stored in the one storage medium.

Title
Storage medium for map information for navigation system and system for offering map information for navigation system
Application Number
946582
Publication Number
5515284
Application Date
April 19, 1995
Publication Date
May 7, 1996
Inventor
Tatsuhiko Abe
Saitama
JP
Agent
Fish & Richardson
Assignee
Zexel Corporation
JP
IPC
G06F 165/00
G01C 21/00
G08G 1/0969
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