Importance

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Abstract

Land vehicle multiple navigation route apparatus (10) includes a computer (11) for calculating at least first and second navigation routes (1, 2, or 3) between start (72) and destination (73) locations. Both routes are preferably visible to the vehicle operator at the same time along with route criteria such as route travel mileage and/or route estimated travel time. The vehicle operator then selects which of the displayed routes is to be used for providing him with route guidance information to the desired destination. The route display format may be a graphic map display (70) with routes displayed in different colors on a color CRT display (18). The second navigation route is calculated after calculating the first route, preferably by excluding some road path segments (1D) which were included in the first calculated route. Preferably the criterion to be used for alternate route calculation is determined prior to calculation of the first route. Preferably a vehicle operator has a choice of routes which may be used for route guidance to a destination without requiring vehicle operator input after the calculation of the first route to specify how to arrive at a second route.

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First Claim