Buy used gyro compass set Sperry Marine MK-37 MOD I Sperry Marine MK-37 MOD I – Used Marine Gyro Compass (MFR Part No.03956-1884334-2) complete set. This set includes MK-37 MOD I master gyrocompass with control unit, transmission unit, compensator unit and two bearing analog repeaters. Sperry MK-37 models are considered…