| 摘要 |
PURPOSE:To improve the convenience of traveling by constituting this device in such a manner that vehicle guide information can be transmitted to a driver in the optimum flexible form meeting road circumferences, the exactness of an optimum route and the reliability of a vehicle position. CONSTITUTION:The form of a route guidance is selected from the transmission of the information on the progressing direction of the vehicle just before a crossing, the transmission of the information on the progressing direction of the vehicle having no restraining force just before the crossing, the transmission of the distance and bearing to a destination or routing point, etc., according to the kinds of the vehicle on which the vehicle travels now, the presence or absence of the registration of the information on traffic regulation in the case of calculation of the optimum route, the accuracy of the map of a road map memory 5 which is the basis for forming the road map data and the specific accuracy of the position of a vehicle position specifying means 8. |
