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Electronic map display system for use on vehicle

  • US 4,780,717 A
  • Filed: 09/17/1986
  • Issued: 10/25/1988
  • Est. Priority Date: 03/25/1983
  • Status: Expired due to Term
First Claim
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1. An electronic map display system for use on a vehicle, comprising:

  • (a) display means for electronically displaying maps and a menu used for designating a map to be displayed;

    (b) first memory means for storing a set of spot coordinates for each of a plurality of spots to be used for constituting maps of a plurality of particular regions, each set of spot coordinates indicating a point on a first coordinate system with respect to a predetermined first coordinate reference point which is independent of said display means;

    (c) second memory means for storing name information corresponding to said particular regions;

    (d) menu display control means for reading said name information from said second memory means and for displaying as said menu on said display means a plurality of the names of said particular regions based on said read name information;

    (e) means for designating one of said names displayed on said display means;

    (f) means for defining a region on said first coordinate system corresponding to the name designated by said designating means;

    (g) means for reading from said first memory means sets of spot coordinates for spots including at least the spots of said defined region and for converting each set of the read spot coordinates into display coordinates with respect to a predetermined second coordinate reference point of a second coordinate system of said display means so as to display on said display means a map of said region defined by said defining means; and

    (h) map display control means for displaying on said display means said map of said region corresponding to said display coordinates converted by said reading and converting means.

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