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Method and apparatus for determining a route on a digitized road network stored in the memory of a navigation system

  • US 6,112,154 A
  • Filed: 05/22/1997
  • Issued: 08/29/2000
  • Est. Priority Date: 05/22/1997
  • Status: Expired due to Term
First Claim
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1. A method of determining a travel route from a starting point to a destination point located on a digitized road network stored in a non-volatile memory of a navigation system, the method which comprises:

  • defining an intermediate destination point between a starting point and a destination point;

    calculating an original partial route from the starting point to the intermediate destination point, and outputting partial route information to a user interface;

    calculating a complete route from the starting point to the destination point;

    overlapping the complete route with the original partial route and defining an intersection point between the complete route and the original partial route; and

    outputting complete route information beginning from the intersection point.

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