Navigation system with off-route detection and route recalculati

Details Navigation system with off-route detection and route recalculati Navigation system with off-route detection and route recalculati

1992-04-07

1993-11-16

Swarthout, Brent

Communications: electrical

Vehicle position indication

Map display

340988, 364449, G08G 1123

Patent

active

052627756

ABSTRACT:
Where a vehicle deviates from a calculated optimal route, the system displays a message indicating the vehicle's deviation. The driver of the vehicle commands computation of a new optimum route. The system selects a new starting point from a point substantially ahead of the vehicle, recomputes the optimal route, and determines the route from the new starting point to the destination. The new starting point is far enough ahead of the vehicle to ensure that the route computation is completed before the vehicle reaches it. This prevents overrunning the new starting point before the calculation of a new optimum route is completed. Navigation guidance, computed for the new optimal route, is then displayed.

REFERENCES:
patent: 4763270 (1988-08-01), Itoh et al.
patent: 4954959 (1990-09-01), Moroto et al.
patent: 4992947 (1991-02-01), Nimura et al.
patent: 5031104 (1991-07-01), Ikeda et al.
patent: 5043902 (1991-08-01), Yokoyana et al.
patent: 5115399 (1992-05-01), Nimura et al.

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