A method and system for updating geographic databases used in systems that provide navigation-related features are disclosed. An original version of a geographic database is formed in which the data are organized into parcels. An updated version of the geo...

The system has a base unit(s) for managing, providing, delivering central navigation data/information, user units connected to the base unit(s), at least one read drive and write drive for data media. The base unit compares stored central data with data re...

A first navigation system is provided with: a present position detecting device (16, 17) for detecting a present position; a plurality of memory devices (14, 15) each capable of reading out map data which is recorded therein; a navigation controlling devic...