04897792 is referenced by 42 patents and cites 7 patents.

A method of recording the travel locus data for an on-board navigation system for motor vehicles stores, at the time of storing data of each location of roads in maps in numberical form, index numbers, which are allotted in sequence to particular locations on the road for each road, together with map numbers each of which is allotted to each map and path numbers each of which is allotted to each road within each map. When the vehicle is running, the map number and the path number are monitored while the present location of the the vehicle is being recognized, and a previous map number, a previous path number and a previous index number are memorized if the present map number is different from the previous map number or the present path number is different from the previous path number. Distinctive point numbers which are allotted to particular locations on the road are also used instead of the path numbers and index numbers. Thus, the amount of data in memorizing the travel locus data is considerably reduced.

Title
Method of memorizing travel locus data for use in an automotive navigation system
Application Number
7/248094
Publication Number
4897792
Application Date
September 23, 1988
Publication Date
January 30, 1990
Inventor
Masayuki Hosoi
Tokorozawa
JP
Agent
Fleit Jacobson Cohn Price Holman & Stern
Assignee
Pioneer Electronic Corporation
JP
IPC
G07B 29/10
G06F 15/50
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