SLAVE CTL 28V GRY 071-1242-02KA 51B Slaving Accessory | 28V, Gray, Vertical MountingThe KA 51B Slaving meter used in the KCS-55A compass system, which also includes KI-525A HSI, KMT-112 Magnetic Azimuth Transmitter, and KG-102A Directional Gyro, Displays slaving error between the KMT-112 and KI-525A..