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We were the first in the world to start mass-producing the fiber optic gyroscope for an automobile navigation system. The fiber optic gyroscope was installed in an automobile in order to improve position detection accuracy. However, mass-producing the fiber optic gyroscope for an automobile navigation system was not possible before because it was difficult to achieve the high performance required under many operating conditions, especially in wide temperature ranges between -20 °C∼70°C. In order to overcome these problems, we have developed a new signal processing for a fiber optic gyroscope having the compensation functions of cancelling the fluctuation of the optical signal. The navigation system using this gyroscope has been installed in the Nissan Motor Company's 1991 CEDRIC, GLORIA, and CIMA models.