NAVIGATION DEVICE, TRAFFIC INFORMATION PROVIDING DEVICE, PROGRAM STORAGE MEDIUM FOR CAR NAVIGATION DEVICE, AND PROGRAM STORAGE MEDIUM FOR TRAFFIC INFORMATION PROVIDING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a car navigation capable of regularly precisely detecting a vehicle position and gaining traffic information in a useful form. SOLUTION: This device is constituted so as not to gain a correction data for DGPS by use of FM broadcasting but to gain the correction data for DGPS from a base station located near the vehicle, whereby the vehicle position can be regularly precisely detected. This device is also constituted so as not to gain traffic information by use of FM broadcasting but by accessing to a traffic information providing system by use of two-way communication, whereby the traffic information such as a place near the present position can be selectively and preferentially gained. Accordingly, the traffic information can be immediately gained when required, and necessary traffic information can be quickly gained.