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