Garmin’s “Most Responsive Autopilot System on the Water”
The GHP Reactor 40 Mechanical Autopilot System is Garmin’s answer for the mariner who has a cable drive, mechanical, or solenoid steering system.
Garmin’s GHP Reactor 40 Mechanical Autopilot System contains a solid state 9-axis Altitude Heading Reference System that enables the GHP Reactor to be mounted nearly anywhere on the boat, while it minimizes heading error, course deviation and rudder movement. Garmin has created the GHP Reactor40 Mechanical Autopilot System to react to hold course even with the vessel pitching and rolling. Although all autopilots require commissioning and calibration the GHP Reactor Mechanical Autopilot System can normally be accomplished in around 5 minutes instead of 20 or more.
Sailboat needs for an autopilot like heading hold, wind hold, tack/jibe, step turns and more, are supported by the GHP Reactor40 Mechanical/ Retrofit/ Solenoid Corepack. The GHP Reactor Mechanical can easily be added to any NMEA 2000 network as well as provide Auto Guidance through a compatible Garmin chartplotter with a G2 Vision Chart.
If you have an existing drive unit and want to change or add autopilot to your boat the GHP Reactor Mechanical/Retrofit/Solenoid is compatible with a wide variety of steering systems, whether hydraulic, cable-drive, mechanical and solenoid. Just pair a GRF 10 with your drive system that is already on board.
Display Size:4.3"W x 4.4"H x 1.9"D
- 9 Axis Attitude Heading Reference System
- Shadow Drive Compatible
- Mounts nearly anywhere
- Minimal Set-up/Calibration
- Supports SailBoat Applications
Product Accessories for Garmin GHP Reactor 40 Mechanical Autopilot Corepack

Garmin GRF 10 Rudder Feedback Sensor
Paired with a GHP20, GHP12 or Reactor Garmin’s GFR 10 will provide rudder position and detect and avoid rudder stops while on the water. Magnetic sensor relays position information so that you know where the rudder is without having to guess.
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Garmin Reactor Autopilot Remote Control
Control your Garmin Reactor Autopilot right from a remote. This rugged and water resistant remote provides the ultimate onboard control and convenience. Control steering and even use the remote for heading hold and course corrections! (compatible with Compact Reactor, Reactor 40 Steer by Wire and Reactor 40 Hydraulic)

Garmin Class B Drive for Garmin Mechanical Autopilot
The Garmin Class B Drive for the GHP 12 Autopilot or Reactor Mechanical Autopilot is designed to work on boats with up to 79,000 lb displacement.

Garmin Actuator Power Cable
The Garmin Power Actuator Cable is required when connecting a third party pump to a Garmin autopilot.

Garmin Class A Drive for Garmin Mechanical Autopilot
The Garmin Class A Drive for the GHP 12 or Reactor Mechanical Autopilot is designed to work on boats with up to 28,000 lb displacement.