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Route guiding method for in-vehicle navigation device

  • US 6,760,662 B2
  • Filed: 04/29/2002
  • Issued: 07/06/2004
  • Est. Priority Date: 05/03/2001
  • Status: Active Grant
First Claim
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1. A route guiding method for an in-vehicle navigation device, comprising the steps of:

  • determining whether a vehicle is on track within a predetermined intersection range based on route guidance data received from a traffic information center via a mobile communication network;

    determining whether the vehicle is in a free run state according to predetermined free run conditions to prevent a preliminary route guidance message that is confusing to a driver of the vehicle in the free run state, if the vehicle is on track within the intersection range; and

    selectively providing the preliminary route guidance message according to whether the vehicle is determined to be in a free run state.

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