Garmin Compact Drive Unit f/GHP 12 Autopilot System B. This device is designed for use with sailboats with up to 48400 lbs of displacement. Compatible Devices: GHP 12 Autopilot System Specifications for Garmin B Compact Drive Unit f/GHP 12 Autopilot System: Manufacturer: Garmin Color: Black Package Contents: Garmin B Compact Drive Unit f/GHP 12 Autopilot System Garmin 010-12029-00: Compact Drive Unit f/GHP 12 Autopilot System B Garmin 010-12029-00: Compact Drive Unit f/GHP 12 Autopilot System