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Navigation system

  • US 5,703,780 A
  • Filed: 07/18/1995
  • Issued: 12/30/1997
  • Est. Priority Date: 01/20/1995
  • Status: Expired due to Term
First Claim
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1. A navigation system mounted on a vehicle, comprising:

  • operating means for inputting a departure position of the vehicle;

    means for detecting a present position of the vehicle from an amount of change in bearing of the vehicle and a distance traveled by the vehicle from the departure position;

    first storing means for storing map data about roads;

    second storing means for reading information from the map data of a road existing ahead of the present position of the vehicle detected by said vehicle position detecting means, converting said information to a string of shape sign data, and storing the result therein as forward road data in the form of shape sign data;

    means for detecting a change-in-road section in which a road orientation greatly varies, from the forward road data stored in said second storing means, by calculating curvatures at points on the road ahead from said forward road data to detect the change-in-road section and judging whether the change-in-road section exists within a range in which a notification is required; and

    notifying means for notifying the operator of the vehicle when the notification has been judged necessary by said change-in-road detecting means.

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