A low cost Gyrocompass has been developed using the Fiber Optic Gyroscope. A 0.16 deg. rms direction finding performance has been demonstrated using a low noise Fiber Optic Gyroscope with depolarized configuration. This paper describes the configuration & performance of FOG & the Gyrocompass (FOG compass).
"Low cost gyrocompass using fiber optic gyroscope", Proc. SPIE 3746, 13th International Conference on Optical Fiber Sensors, 37460W (1 September 1999); doi: 10.1117/12.2302022; https://doi.org/10.1117/12.2302022