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Sensor free vehicle navigation system utilizing a voice input/output interface for routing a driver from his source point to his destination point

  • US 6,587,786 B1
  • Filed: 08/20/1993
  • Issued: 07/01/2003
  • Est. Priority Date: 12/03/1990
  • Status: Expired due to Fees
First Claim
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1. A method of operating a navigation system in order to produce navigation directions to assist travel from a starting location to a destination along a route consisting of a sequence of individually identifiable route segments selected from a plurality of route segments which occupy a geographic area, each route segment having a length and two ends, each end being located at a node and each node joining together a plurality of route segments, said method comprising:

  • storing map information, including information identifying the plurality of route segments, in an electrically accessible storage medium in the system, the stored map information including a list of route segment data containing a list element for each route segment, with the list element for a given route segment containing data identifying each other route segment which is joined to the given route segment by a node and which may be entered from the given route segment;

    receiving, from an individual, inputs identifying the starting location and the destination;

    converting the inputs from the individual into respective stored representations of the starting location and the destination as represented by the inputs;

    utilizing the stored representations to retrieve from the storage medium information identifying successive route segments forming a desired route between the starting location and the destination corresponding to the stored representations; and

    producing an output describing the successive route segments to the individual.

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