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Navigation apparatus for vehicle

  • US 4,827,420 A
  • Filed: 06/11/1987
  • Issued: 05/02/1989
  • Est. Priority Date: 06/12/1986
  • Status: Expired due to Term
First Claim
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1. A navigation apparatus for a vehicle being provided with a travelling distance detection means, an azimuth detection means for detecting a traveling direction of said vehicle, a map memory for storing therein map information relating to a traveling route of said vehicle, a display unit and display control means therefor which reads out the map information from said map memory and graphically displays said map information on said display unit, and a present location computation means which computes present location information of said vehicle on a basis of detection results of said traveling distance detection means and the azimuth detection means and displays said present location information on an image of said display unit, comprising;

  • an input means for introducing therein a place name and coordinates of longitude and latitude of an arbitrary spot as spot information thereof;

    a spot memory for storing therein said spot information;

    a stoppage duration detection means for detecting a continuous stoppage duration of said vehicle;

    a closest spot search means for searching said spot memory for a spot closest to the present location computed by said present location computation means;

    a distance computation means which reads out from said spot memory said coordinates of longitude and latitude found by said closest spot search means so as to compute a distance between said coordinates and said present location computed by said present location computation means; and

    a present location correction means which reads out from said spot memory the coordinates of longitude and latitude of the place found by said closest spot search means and replaces the present location information with said coordinates, when the distance computed by said distance computation means is smaller than a predetermined value and the stoppage duration detected by said stoppage duration detection means is greater than a predetermined duration.

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