Navigation System

A method for data management of a motor vehicle navigation system, comprising:

• calculating driving routes in a navigation computer;
• receiving a driving start position, and final destination position through a data input unit, which is connected to the navigation computer;
• transmitting to the user the driving routes calculated by the navigation computer;
• storing in a first memory unit connected to the navigation computer basic database that includes digital road map information, which is needed to calculate the driving route;
• receiving data supplementary to the basic database, such as detailed information of digital road maps, over a network connection to a communication unit that is connected to the navigation computer;
• and
• storing the received supplementary data in a second memory unit that is connected to the navigation computer.

A navigation system for use in a motor vehicle that receives starting position data and destination position data and computes driving directions between the starting and destination positions, said navigation system comprising:

• a first memory unit that stores a basic navigation database including road map information;
• an RF receiver that receives supplemental navigation data including digital road maps, and provides received supplemental navigation data;
• and
• a second memory unit that receives and stores said received supplemental navigation data;
• means for receiving said received start position data, said received destination position data, and for computing driving directions between the starting position and the destination position using information from said basic navigation database and said received supplemental navigation data;
• and
• means for outputting said driving directions to the user.