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Navigation apparatus for vehicles

  • US 5,752,219 A
  • Filed: 01/21/1997
  • Issued: 05/12/1998
  • Est. Priority Date: 03/06/1990
  • Status: Expired due to Fees
First Claim
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1. A vehicle navigation system, comprising:

  • a global positioning system (GPS) receiver for receiving signals from satellites;

    means for determining whether or not the signals received are sufficient for calculating a present position of a vehicle;

    means for calculating the present position of the vehicle;

    means for displaying the present position of the vehicle in a first form of display as a most recent correct position displayed solely whenever said determining means determines that the signals received are sufficient for calculating the present position of the vehicle; and

    means for changing the most recent correct position displayed into an altered form of display and ceasing to display the present position of the vehicle whenever said determining means determines that the signals received are insufficient for calculating the present position of the vehicle.

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