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Method and apparatus for adjusting distance for generating maneuver instruction for navigation system

  • US 20090216431A1
  • Filed: 02/26/2008
  • Published: 08/27/2009
  • Est. Priority Date: 02/26/2008
  • Status: Abandoned Application
First Claim
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1. A distance adjustment method for a navigation system, comprising the following steps of:

  • conducting a route guidance operation of the navigation system for guiding a user to a destination through a calculated route;

    searching an upcoming intersection on the calculated route that requires the user to make a turn therein within a predetermined distance range ahead from a current position;

    retrieving data concerning the upcoming intersection from a map database;

    adjusting a final distance from a reference point of the intersection by evaluating the retrieved data concerning the intersection; and

    generating a maneuver instruction at a timing when the user has reached the adjusted final distance from the reference point of the intersection, thereby notifying the user to make a turning maneuver at the intersection.

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