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Navigation system for vehicles

  • US 5,371,497 A
  • Filed: 08/05/1993
  • Issued: 12/06/1994
  • Est. Priority Date: 08/19/1992
  • Status: Expired due to Fees
First Claim
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1. A navigation system for vehicles, comprising:

  • (a) present position detecting means for detecting a present position of a vehicle;

    (b) map information storage means for storing map information;

    (c) route calculating means for searching a route to a destination by using the map information stored in the map information storage means;

    (d) display means having at least first and second display screens;

    (e) drawing control means for drawing a guide map of a next stage of the route on one of the first or second display screens while displaying a guide map of a present stage of the route on the other of the first or second display screens; and

    (f) display change means for changing the first and the second display screens to display guide maps of the route on the first and second display screens alternately on the basis of the detected present position, thereby, after displaying the guide map of the present stage of the route on the first display screen, displaying the guide map of the next stage of the route on the second screen drawn by the drawing control means while the guide map displayed on the first screen remains unchanged, and then after finishing the drawing of the display of the second screen, displaying on the first screen a guide map of a subsequent stage of the route on the first screen drawn by the drawing control means while the guide map displayed on the second screen remains unchanged.

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