초록 ▼

A commucations navigation system in which data is transmitted and received between a navigation base apparatus provided at a navigation base and a vehicle navigation apparatus provided in a vehicle using communication. The vehicle navigation apparatus is adapted to transmit at least data concerning

A commucations navigation system in which data is transmitted and received between a navigation base apparatus provided at a navigation base and a vehicle navigation apparatus provided in a vehicle using communication. The vehicle navigation apparatus is adapted to transmit at least data concerning the current position of the vehicle and the destination thereof to the navigation base apparatus, and the navigation base apparatus stores navigation data in its data base and is adapted to determine a recommended route based on the transmitted data of the current position of the vehicle and the destination thereof and then extract data of the recommended route from the navigation data stored in the data base and transmit the extracted data to the navigation apparatus. The navigation base apparatus is adapted to be able to extract detailed navigation data only for a surrounding areas of a specified point on the recommended route from the navigation data stored in the data base and then transmit the detailed navigation data to the navigation apparatus. The specified point includes a departure point, a destination and a course-change point which are located on the recommended route. During traveling other places on the recommended route such as intermediate sections, the navigation apparatus transmits simple navigation data such as a simple map to the vehicle, thereby enabling to reduce an amount of data to be transmitted from the navigation base apparatus to the vehicle navigation apparatus.

대표청구항 ▼

[ What is claimed is:] [1.]1. A communications navigation system in which data is transmitted and received by means of wireless communication between a navigation base apparatus provided at a navigation base and a navigation apparatus provided in a moving body such as a vehicle wherein the navigatio

[ What is claimed is:] [1.]1. A communications navigation system in which data is transmitted and received by means of wireless communication between a navigation base apparatus provided at a navigation base and a navigation apparatus provided in a moving body such as a vehicle wherein the navigation apparatus comprises:means for transmitting at least data concerning the current position of the moving body and the destination thereof to the navigation base apparatus; andwherein the navigation base apparatus comprises:navigation data storing means for storing navigation data including detailed map information;means for determining a recommended route based on the received data of the current position of the moving body and the destination thereof, and for extracting data of the recommended route from the navigation data stored in the navigation data storing means, and then transmitting the extracted data to the navigation apparatus; andintersection judgement means for determining an angle between roads on said recommended route into and out of each intersection and fork on said recommended route and for identifying each intersection and fork for which said angle is less than a predetermined value as a course-change point;wherein the navigation base apparatus is adapted to be able to extract detailed map information limited to only that for an area surrounding the course-change point on the recommended route, from the navigation data stored in the navigation data storing means, and then transmit the extracted detailed map information to the navigation apparatus; andwherein the navigation apparatus is configured so as to display an indication of travelling direction of the moving body at the course-change point based on the detailed map information received from the navigation base apparatus.