Importance

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Abstract

In a vehicle navigation system having memory for storing road map information, calculating unit for calculating the optimum route from a given initial location to the destination and display device for sequentially displaying the directions in which the vehicle operator should drive to follow the route, the system comprises a command unit for commanding the calculating unit to recalculate the route when the vehicle deviates from the route and halt/resume unit for halting and resuming the operation of the calculating unit. When the operator decides to make a temporary deviation from the calculated route, he can use the halt/resume unit to prevent the system from recalculating the route when he leaves it and then can use it again to restart the route guidance when he return to it. This prevents unnecessary calculations from being made.

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First Claim