To facilitate the operation of an in-vehicle navigation system and to shorten
the time required for the otherwise time-consuming entering of the destination
by crosshairs by reducing the operating steps required, a general map and an enlarged
portion of the general map are displayed simultaneously on a screen. A navigation
computer calculates the routes. Map data from general maps and detail maps are
stored in a memory. A main computer calculates the portion selectable for example
by crosshairs and shown on an enlarged scale, from the data stored in the memory.
The general map and the enlarged portion can be moved synchronously with one another
on the screen by a graphic control unit.
