Route guidance system for road vehicle - uses data stored for access by system in vehicle to indicate directions to be taken

摘要

The route guidance system has prepared data stored on discs that are loaded into the computer system of the vehicle. The route data provides detailed guidance within a city or twon. A comparison is made between distance measurements that are based upon the tachometer output and the stored values. Parts of the journey made along a motorway require little data storage. The commencement of guidance based upon the detailed data can be initiated at an exit point. ADVANTAGE - Provides simple means of route guidance for road vehicles.