Garmin Shadow Drive f/GHP™ GHP™ 12 & GHP™ 20Garmin Shadow Drive for GHP 12 & GHP 20 combines precision autopilot support with hands on control. Based on the GHP 10s patented Shadow Drive technology, it gives you the security of knowing you maintain control even when relying on the autopilot. This Shadow Drive attachment automatically disengages the autopilot if the helm is turned, allowing the helmsman to maneuver the boat with confidence. Key Features 1 4" Female NPT fittings for secure
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