Navigation system for an automotive vehicle

  • US 5,689,252 A
  • Filed: 03/07/1996
  • Issued: 11/18/1997
  • Est. Priority Date: 11/04/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. A vehicle navigation system for identifying a desired map route between a first position of a vehicle and a second position, which comprises:

  • (a) map means for storing a plurality of road maps and speed limit values for roads therein;

    (b) input means for enabling a user to select said first and second positions;

    (c) selecting means for selecting a road map from those stored in said map means on the basis of said selected first and second positions of said vehicle;

    (d) traffic receiving means for receiving traffic information including speed rates transmitted in a data representation format of variable length differences from said stored speed limit values for respective roads contained on said selected road map over a wireless channel from a centrally located database to said vehicle; and

    (e) means for determining a route of shortest duration between said first position and said second position from said selected road map on the basis of said speed rates received by said traffic receiving means and the length of travel between said first and second positions of said vehicle.

View all claims

    Thank you for your feedback