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Method of memorizing travel locus data for use in an automotive navigation system

  • US 4,897,792 A
  • Filed: 09/23/1988
  • Issued: 01/30/1990
  • Est. Priority Date: 09/29/1987
  • Status: Expired due to Fees
First Claim
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1. A method of recording the travel locus data for an on-board navigation system of a motor vehicle, the method comprising the steps of:

  • storing previously determined location data of road maps in numerical form into a first memory including storing a map number for each map, a path number for each road within each map, and an index number for particular locations on each road in each map;

    determining the present location data from the present location of the vehicle including a present map number, a present path number and a present index number while the vehicle is moving along a particular path; and

    comparing the previously determined location data with the present location data and if the present map number is different from the previous map number or if the present path number is different than the previous path number, storing the previously determined location data into a second memory as said travel locus data.

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