A HRG gyrocompass is a compass and instrument of navigation.
generation of maintenance-free instruments.
It uses a hemispherical resonant gyroscope, accelerometers and computers to compute true north.
The HRG gyrocompass is a complete unit, which unlike a conventional compass, has no rotating or other moving parts.
[1] Its operational Mean Time Between Failure (MTBF) values are improved over a Fiber Optic Gyrocompass and also conventional mechanical gyrocompass.