Patent ID: 6847889

Claim:
A navigation system comprising: an information center having a map database, for receiving information about a present vehicle position and a destination from a navigation terminal, searching out an optimum route between the present position and the destination referring to map data in the map database, and generating route guidance data to guide a vehicle to at least one node point on the optimum route; the navigation terminal inside the vehicle having a separate mobile terminal for wirelessly connecting to a wireless communication network and a separate ITS (Intelligent Transportation System) terminal having a GPS (Global Positioning System) device, for calculating the present position of the vehicle, transmitting the vehicle's current position information from the ITS terminal to the information center, receiving the route guidance data from the information center, determining a notification message regarding the at least one node point from the present position and guidance codes in the route guidance data, and generating the notification message about the at least one node point referring to a database contained in the navigation terminal, and announcing the notification message in a predetermined period before the vehicle passes through the node point; and a wireless communication network for connecting the information center to the ITS terminal via the mobile terminal wirelessly.