Patent ID: 8560231
Filing Date: 2013-10-15
Classification: G01C

Abstract:
1. A distance adjustment method for a navigation system, comprising the following steps of: conducting, by using a central processor unit, 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; retrieving a reference distance from a reference point of the intersection; determining an adjusted distance based on a direction of a turning maneuver at the intersection and other relevant information derived from the retrieved data concerning the intersection, which further includes the steps of: establishing a final distance from the reference point of the intersection by incorporating the adjusted distance; and generating a maneuver instruction at a timing when the user has reached the final distance from the reference point of the intersection, thereby notifying the user to make the turning maneuver at the intersection; wherein the adjusted distance is greater than zero.