05291414 is referenced by 63 patents and cites 8 patents.

When a vehicle has deviated from a computer-determined optimal route from a starting point to a destination, a navigation system warns the vehicle driver that he is off the optimal route, picks an appropriate direction for continued travel, selects a new starting point, and computes a new optimal route from the new starting point to the destination. By selecting the new starting point based on the vehicle's present location and the time to recompute a new optimal route, the system eliminates the necessity for a driver either to go back to the original optimal route, to recompute the optimal route by a manual operation, or to recompute a new optimal route more than once.

Title
Navigation system for guiding a vehicle along a precomputed optimal route
Application Number
7/868483
Publication Number
5291414
Application Date
April 14, 1992
Publication Date
March 1, 1994
Inventor
Tatsuhiko Abe
Saitama
JP
Haruhisa Tamai
Sunnyvale
CA, US
Agent
Thomas R Morrison
Assignee
Zexel Corporation Diahatsu Nissan Ikebukuro
JP
IPC
G06F 15/50
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