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Navigation system for indicating of optimum route

  • US 6,026,346 A
  • Filed: 11/27/1996
  • Issued: 02/15/2000
  • Est. Priority Date: 11/27/1996
  • Status: Expired due to Term
First Claim
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1. A navigation apparatus for guiding a vehicle to a destination along a guide route, comprising:

  • (a) an off-route detection means for detecting an off-route condition when the vehicle is on a road displaced from the guide route;

    (b) a guide route searching means for searching when the off-route detection means detects an off-route condition, a route from a present position of the vehicle to the destination or a return point on the guide route;

    said guide route searching means including;

    (i) weight factor determining means for determining a weighting value to modify a road parameter used in searching for the guide route;

    (ii) modifying means for modifying the road parameter of a road on which the vehicle is traveling based on the weighting value; and

    (iii) calculating means for calculating a route from the present position of the vehicle to the destination or the return point on the guide route, as a function of the modified parameter.

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