Guiding method for an object, especially a motor vehicle using a navigation system, back along a route already traveled, especially where the route lies outside available navigational data

摘要

Method has the following steps: provision of route data to a driver as long as he remains within a geographical area for which data is available; if the driver leaves the area where data is available, recording of position data until the vehicle is back in a known orientation point, i.e. a point that has already been passed; and finally when an orientation point is reached, guiding of the driver back using the recorded position data. An Independent claim is made for a system for returning a driver using a navigation system to the point at which he left the geographical area corresponding to available digital map data. The system works by returning the driver along an inverse route to that followed when the area of available data was left.