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Vehicular navigation system

  • US 5,757,289 A
  • Filed: 06/06/1995
  • Issued: 05/26/1998
  • Est. Priority Date: 09/14/1994
  • Status: Expired due to Term
First Claim
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1. A vehicular navigation system comprising:

  • destination setting means for setting a destination;

    storage means containing stored map information and stored guide information for guidable and unguidable roads, a guidable road being a road for which said storage means contains sufficient map information and guide information for the navigation system to include the road in searching to determine a route and to provide guidance for the road;

    detecting means for detecting a present position and an advancing direction of a vehicle;

    route searching means for searching, among said guidable roads, to determine a route from the present position to the destination on the basis of the stored map and guide information in said storage means;

    guide means for providing travel guidance based upon the searched route and subsequently detected present positions on the searched route;

    route deviation detecting means for detecting a deviation of travel from the searched route based on a subsequent detected present position deviating from the searched route;

    guide road propriety deciding means, responsive to the route deviation detecting means detecting a deviation of travel, for deciding whether or not the detected deviating present position is on a guidable road; and

    re-search means for re-searching the route based on the stored map and guidance information in said storage means on condition that the route deviation is detected by said route deviation detecting means and that it is decided by said guide road propriety deciding means that the detected deviating present position is on the guidable road so that said guide means provides guidance on the basis of the route which is researched by said re-search means.

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