Patent ID: 6904362

Claim:
A navigation system comprising: (a) an information center comprising an information center side transmission/reception section for communication, a route search section for searching for a route, based on a present position and destination, and an information generating section for generating guidance information for guidance along the route found by the route search section and for extracting major guide point information for major guide points, along the route found by the route search section, from the guidance information; and (b) a vehicular apparatus comprising a destination setting section for setting a destination, a present position determination section for determining the present position, and a guidance output section for outputting major guide point information including all major guide points on the route found by the route search section and additional route guidance information, a vehicle side transmission/reception section for transmitting the set destination and the determined present position to the information center and for receiving the major guide point information during a first period of transmission from the information center and for receiving the additional route guidance information during a second period of transmission from the information center, subsequent to said first period, and storage means for storing the received information, said guidance output section giving guidance limited to the major guide point information when the vehicle side transmission/reception section is unable to receive the additional route guidance information from the information center.