Road traffic navigation system with detour route function - comprises computer controlled system with facility to establish main and secondary routes

摘要

A traffic navigation system for use in road vehicles has a memory that stores road map data on CD ROMs (3A) accessed by a CD player (3). The system has a processor (1A) that also connects to a display (4), keyboard (5A) and a position sensor unit (6). The sensor system identifies the current vehicle position and locates this on the road map. The user identifies a target destination and a main route is identified. If a detour is necessary, an entry identifies the location and an alternative route is established and displayed. ADVANTAGE - Allows routes to be established with detour requirements included.