Vehicular navigation system

Details Vehicular navigation system Vehicular navigation system

1995-06-06

1998-05-26

Swarthout, Brent A.

Communications: electrical

Vehicle position indication

Map display

340990, 3644493, 3644494, G08G 1123

Patent

active

057572895

ABSTRACT:
A vehicular navigation system includes a central control unit which determines when a present position deviates from a searched route along which guidance is being provided from a starting point to a destination and determines whether or not the detected deviating present position is on a guidable road prior to re-searching the route and providing guidance based upon the re-searched route. A guidable road is a road upon which the navigation system contains sufficient map information and guide information for the navigation system to search a route and provide guidance. Additionally, system determines whether the vehicle has traveled a predetermined distance after re-search of the route prior to providing travel guidance based upon the re-searched route. Otherwise travel guidance continues to be provided based upon the previously searched route. A driver, after making a short deviation, may thus return to the previous route without travel guidance being interrupted by a re-searched route.

REFERENCES:
patent: 5043902 (1991-08-01), Yokoyama et al.
patent: 5184303 (1993-02-01), Link
patent: 5243528 (1993-09-01), Lefebvre
patent: 5262775 (1993-11-01), Tamai et al.

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