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Navigation system, and program and storage medium for use in the same

  • US 20040143387A1
  • Filed: 12/18/2003
  • Published: 07/22/2004
  • Est. Priority Date: 12/18/2002
  • Status: Active Grant
First Claim
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1. A navigation system that searches for a route to a destination based on stored map data and provides navigation guidance to the destination along the route, comprising:

  • a controller that;

    acquires road congestion information associated with the route;

    searches for the route to the destination based on a calculated search cost; and

    changes a search cost based on predicted secondary congestion that is predicted based on acquired road congestion information, wherein a recommendable route that can avoid congestion is searched based on the search cost that has been changed based on the predicted secondary congestion.

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