VEHICLE NAVIGATION SYSTEM.

摘要

This invention relates to a vehicle navigation system including an input device (1), a CPU (2), a display (3) and a storage device (4). The storage device (4) is a CD-ROM or the like for storing the network data and information of each point as the destination or the present position and map data (10), a crossing list (11), a destination list (12), road data (13), a place name list (14), etc., are stored therein. When the destination is inputted and designated by the input means (1), the CPU (2) interacts with a program stored in a ROM (9a) in order to set data for reaching the destination by means of the retrieval of a route corresponding to each point stored in the storage device (4) and stores it in memory such as a RAM (9b). In an embodiment, a non-volatile area for storing the starting point data (the east longitude, the north latitude, ect.) is disposed in the RAM (9b) and when data is inputted by a reset switch at the time of the inputting of the starting point, data in this non-volatile area can be rewritten. The data thus written is held until the reset switch is pressed again to input a location position and is not erased even when an ingnition switch is turned off.