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Vehicle navigational apparatus for displaying a road map

  • US 4,689,747 A
  • Filed: 06/20/1985
  • Issued: 08/25/1987
  • Est. Priority Date: 06/21/1984
  • Status: Expired due to Fees
First Claim
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1. A navigational apparatus for displaying a road map which has a plurality of pages, comprising:

  • command entry means having a plurality of keys associated respectively with equally divided sections of a specified one of the plurality of pages of the road map, said command entry means for specifying a desired page of the map;

    memory means for storing road map data which corresponds to the road map to be displayed;

    display means; and

    processing means responsive to said command entry means, for;

    (1) providing information to said display means to provide a display of a page number indication of said specified one page of the road map, (2) addressing said memory means according to said specified one page to read stored data from said memory means corresponding to said one page, (3) passing said stored data to said display means to display said road map, (4) generating, responsive to each of successive operations of said keys of said command entry means, a digit of a multidigit code indicating a location of a desired landmark on said display means, the number of said digits in said multidigit code indicating a size of said landmark, and (5) displaying said landmark on said display means with an intensity which is an inverse function of the number of said digits.

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