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Electronic navigation system and method

  • US 6,107,944 A
  • Filed: 09/10/1998
  • Issued: 08/22/2000
  • Est. Priority Date: 06/24/1994
  • Status: Expired due to Term
First Claim
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1. A method of expanding the amount of information available to a remote unit in a routing system having a base unit and a remote unit, comprising the steps of:

  • (a) electromagnetically transmitting a route request from the remote unit to the base unit;

    (b) electromagnetically transmitting data representing a route from the base unit to the remote unit in response to the route request of step (a);

    (c) receiving in the remote unit the data representing a route transmitted in step (b);

    (d) in the remote unit, using a navigation application program to compare the data representing a route received in step (c) with coverage of databases on-board the remote unit;

    (e) if an entire route received in step (c) is not covered by said databases on-board the remote unit, electromagnetically transmitting from the remote unit to the base unit a request for the base unit to provide information in addition to that which is covered by said databases on-board the remote unit; and

    (f) receiving in the remote unit said information in response to the request of step (e).

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