Initial look: Powering up the Garmin GHC 50 vs GHC 20 - YouTube
Buyr.com | Autopilots | Garmin Ghc 20 Marine Autopilot Control Display Unit
Garmin GHC™ 20 Marine Autopilot Control Unit
Garmin GHC™ 20 Marine Autopilot Control Unit
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GHC™ 20 Owner's Manual
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Amazon.com: Puccy Case Cover, Compatible with Garmin GHC 20 Marine Autopilot Control Unit Black Waterproof Pouch Dry Bag (Not Screen Protector Film) : Electronics