On the water with Garmin's GHP 12 Sailboat Autopilot - Garmin Blog
GARMIN SHADOW DRIVE FOR GHP™ GHP™ 12 & GHP™ 20 | eBay
Garmin/GHP 12-Autopilot ECU- Good Condition! - Tested Good - Free Shipping - Max Marine Electronics
Garmin GHC™ 20 Marine Autopilot Control Unit
Garmin GHC™ 20 Marine Autopilot Control Unit
Amazon.com: Garmin 010-11573-00 Class B Drive Unit for GHP 12 Marine Autopilot System, Hydraulic Linear Drive Unit, 12" (303 mm) Stroke Length, 2380 lb (1080 kg) Maximum Thrust : Cell Phones & Accessories