Method and apparatus for adjusting distance for generating maneuver instruction for navigation system
First Claim
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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Abstract
A distance adjustment method and apparatus for a navigation system produces a maneuver instruction for an intersection at the most appropriate timing and location during the route guidance. The method includes the steps of: searching an upcoming intersection on the calculated route that requires the user to make a turn therein; 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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Citations
20 Claims
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1. A distance adjustment method for a navigation system, comprising the following steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A distance adjustment apparatus for a navigation system, comprising:
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means for conducting a route guidance operation of the navigation system for guiding a user to a destination through a calculated route; means for 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; means for retrieving data concerning the upcoming intersection from a map database; means for adjusting a final distance from a reference point of the intersection by evaluating the retrieved data concerning the intersection; and means for 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification