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This paper describes an Automobile Navigation System with Multi-Source Guide Information. One of the features of this system is accurate location detection, which uses refined map-matching method incorporating a high accuracy rotation sensor, Fiber Optic Gyroscope (FOG). The system shows the position of the vehicle on a CRT map display and can also provide useful information, such as the locations of hotels, golf courses, etc., by using a CD-ROM disc. In addition to this information, this system can play CD-ROM discs based on the CDCRAFT standard. By means of this standard, software vendors can produce multimedia entertainment, such as a sightseeing guide with voice. Also, this system can display road and traffic information from the roadside radio beacons of the Vehicle Information & Communication System (VICS). This navigation system has been installed in Nissan's 1991 model Cedric, Gloria and CIMA.

The wheel rotation sensor developed for navigation system is small and light, and generates high output voltage of 0.37V p-p without a prc-amplifier when the gap between the sensor and the multi-polarized magnetic rotor is 2.0mm. The sensor has excellent resistance to environmental conditions. Several simulation tests and car evaluations were carried out and it is confirmed that the sensor generates enough output voltage and satisfies requirements for the system including the decrease of output voltage caused by temperature, gap variation while running, and so on.