Garmin Reactor 40 Hydraulic Autopilot w/o GHC 20

Discover Unmatched Precision on the Water

Imagine cruising through choppy waters or holding a steady course during a long offshore run without constantly adjusting the helm. The Garmin Reactor 40 Hydraulic Autopilot corepack delivers exactly that—responsive, reliable steering that adapts to your boat's every move. Designed for hydraulic steering systems on powerboats and sailboats alike, this system transforms navigation from a chore into a seamless experience.

Whether you're powering an inboard, outboard, stern drive, or diesel setup, or handling the demands of a sailboat, the Reactor 40 stands out for its ability to minimize corrections and maximize comfort. Boaters rave about how it handles real-world conditions, from crosswinds to swells, keeping your path true while sipping power efficiently.

Core Technology That Feels Intuitive

At the heart of this autopilot is a cutting-edge solid-state 9-axis AHRS sensor. Unlike older systems that demand perfect alignment, this one mounts flexibly—anywhere, any orientation—and self-adjusts for pinpoint accuracy. The result? Less heading drift, smoother turns, and a ride that feels natural, even in rough seas.

• Sea-Adaptive Response: It reads the ocean's rhythm, countering pitch and roll to maintain your course effortlessly.
• Quick Setup: Skip the hours of tweaking; commissioning takes minutes, so you're underway faster.
• Power-Smart Design: Precise control means fewer rudder movements, stretching your battery life on extended trips.

Shadow Drive: Control Without Compromise

The patented Shadow Drive feature is a game-changer for safety-conscious skippers. Engage the autopilot for hands-free cruising, but take the wheel anytime—the system senses your input, disengages instantly, and re-engages smoothly once you're steady. It's like having a vigilant crewmate who never overrides your command.

Perfect for those sudden maneuvers around obstacles or docking in tight marinas, this tech builds confidence, letting you focus on the horizon rather than the helm.

Versatile Features for Every Boater

This corepack packs powerboat prowess and sailing smarts into one unit. Hold headings effortlessly, lock into wind angles for sails, automate tacks and jibes, or execute patterned step turns for trolling. Integrate it with your existing Garmin chartplotter via NMEA 2000 for remote control, custom routes, and advanced patterns—ideal for fishing pros chasing structure or cruisers plotting efficient passages.

"On my 35-foot express cruiser, the Reactor 40 turned 8-hour runs into relaxed joyrides. No more fatigue from fighting the wheel in 3-footers." – Experienced offshore boater

Effortless Integration and Expansion

Plug into your Garmin network for full touchscreen control from the helm or flybridge. Pair with compatible charts for automated guidance paths that suggest optimal routes around hazards. It's built tough for marine environments, with robust components that withstand spray, vibration, and salt.

For hydraulically steered vessels, installation is straightforward—connect the ECU to your pump, wire up the CCU, and calibrate on the water. Many owners report setup in under an hour, thanks to intuitive prompts and included accessories.

What's Included for a Complete Corepack

• Reactor 40 CCU (Course Computer Unit) – The brain of precise navigation.
• ECU (Electronic Control Unit) – Interfaces seamlessly with hydraulic systems.
• ECU power cable and interconnect cable – Plug-and-play wiring.
• Shadow Drive sensor – Ensures instant manual override.
• Buzzer for alerts – Keeps you informed audibly.
• NMEA 2000 drop cables (2 meters), power cable, T-connectors, and terminators – Ready for network integration.
• Comprehensive documentation – Step-by-step guides for pros and DIYers.

Pro Tips for Peak Performance

To get the most from your Reactor 40, mount the AHRS away from magnetic interference like speakers or engines. Regularly rinse connections with fresh water after saltwater exposure, and update firmware via your Garmin display for the latest sea-state algorithms. Pair it with a GHC display (sold separately) for standalone helm control if needed.

Boaters upgrading from basic tiller pilots love the hydraulic precision—it's quieter, more responsive, and handles heavier displacement boats with ease. Fuel savings from steady steering add up on long hauls, making it a smart investment for frequent adventurers.

Frequently Asked Questions

What types of boats is the Garmin Reactor 40 Hydraulic Autopilot compatible with?

It's optimized for hydraulically steered powerboats like inboards, outboards, stern drives, and diesels, as well as hydraulic sailboats. Not suitable for Garmin Smartpump systems.

How does the 9-axis AHRS improve autopilot performance?

The solid-state 9-axis AHRS allows flexible mounting in any orientation, reduces heading errors and course deviations, and delivers a smoother ride by adapting to sea conditions in real-time.

What is Shadow Drive technology and how does it work?

Shadow Drive automatically disengages the autopilot when you turn the helm manually, then re-engages once you hold steady. It ensures you always retain full control for safety.

Is installation difficult for the Reactor 40 corepack?

No—minimal commissioning and calibration make it user-friendly. Most setups take under an hour with the included cables and NMEA 2000 accessories.

Can this autopilot integrate with Garmin chartplotters?

Yes, via NMEA 2000, it offers full remote control, trolling patterns, and Auto Guidance features when paired with compatible Garmin displays and charts.

Does the corepack include a display?

This version is without the GHC 20 display, designed for integration with existing Garmin chartplotters or adding a separate GHC later.

What sailing features does it support?

Includes wind hold, tack/jibe automation, heading hold, and step turns, making it versatile for both power and sail applications.

Reactor 40 Hydraulic Autopilot without GHC 20

** Not designed to be used with Garmin Smartpump **

The Most Responsive Autopilot System on the Water

• Solid-state 9-axis Attitude Heading Reference System (AHRS)
• Minimizes heading error, course deviation, rudder movement and power consumption while providing a comfortable ride
• Minimal commissioning and calibration
• Shadow Drive technology keeps you in control, even when autopilot is engaged

With a complete package designed for powerboats and sailboats, Garmin brings an advanced marine technology to the boating public that was once only available for commercial boats. The Reactor 40 autopilot series is simply the most responsive autopilot system we have ever offered.

Reactor 40 autopilots are very versatile. Both powerboat and sailing features are available in all corepacks, including heading hold, wind hold, tack/jibe, step turns and more; simply pick the autopilot that's compatible with your existing steering system.

The Reactor 40 hydraulic autopilot corepack is ideal for all types of hydraulically steered powerboats inboards, outboards, stern drives and diesels or hydraulically steered sailboats. This robust unit gives powerboat users an easy-to-use autopilot system to rely upon for navigation. With its solid-state 9-axis AHRS, Reactor 40 mounts nearly anywhere, in any orientation and requires minimal commissioning. Our patented Shadow Drive technology gives boaters the security of knowing they maintain control, even when relying upon the autopilot.

Solid-state 9-axis AHRS
With its advanced solid-state 9-axis solid-state 9-axis AHRS, you can mount Reactor 40 nearly anywhere, in any orientation. In addition, this new system greatly minimizes heading error, course deviation, rudder movement and power consumption while providing a comfortable ride for all on board.

Reacts to Conditions
This amazing autopilot actually reacts to the sea to hold your course. Even when the boat is pitching and rolling, you can remain confident that the Reactor 40 autopilot will keep you on your desired course.

Minimal Commissioning and Calibration
All autopilots require commissioning and calibration all of them. We know you just want to get on the water, so we made this process as fast and easy as possible. That's the power of simple.

Full Integration with Garmin Chartplotters
Combined with a compatible Garmin networked chartplotter, you can have full control of Reactor 40 from wherever you are on the boat. In addition to holding its course in virtually all weather and wind conditions, the system can smoothly perform a variety of preprogrammed trolling and search procedures. Plus, with a compatible Garmin networked chartplotter and BlueChart g2 Vision charts (sold separately), you gain optional features such as Auto Guidance, which automatically steers GPS paths.

Stay in Control with Shadow Drive Technology
The Reactor 40 autopilot features patented Shadow Drive technology. This gives you the security of knowing you maintain control, even when the autopilot is engaged. The Shadow Drive system automatically disengages the autopilot if the helm is turned, giving you the freedom to maneuver the boat. The autopilot automatically re-engages when you hold a steady course.

Auto Guidance is for planning purposes only and does not replace safe navigation operations

What's In The Box?

• Reactor 40 CCU (Course Computer Unit)
• ECU (Electronic Control Unit)
• ECU power cable
• Interconnect cable
• Shadow Drive
• Buzzer
• NMEA 2000 drop cables (2 meters)
• NMEA 2000 power cable
• NMEA 2000 T-connectors
• Male and female terminators
• Documentation

Garmin Reactor 40 Hydraulic Autopilot Corepack Without GHC

Model: 010-00705-21

• Solid-state 9-axis Attitude Heading Reference System (AHRS)
• Minimizes heading error, course deviation, rudder movement and power consumption while providing a comfortable ride
• Minimal commissioning and calibration
• Patented Shadow Drive™ technology keeps you in control, even when autopilot is engaged

With a complete package designed for powerboats and sailboats, Garmin brings an advanced marine technology to the boating public that was once only available for commercial boats. The Reactor 40 autopilot series is simply the most responsive autopilot system we have ever offered.

Reactor 40 autopilots are very versatile. Both powerboat and sailing features are available in all corepacks, including heading hold, wind hold, tack/jibe, step turns and more; simply pick the autopilot that’s compatible with your existing steering system.

The Reactor 40 hydraulic autopilot corepack is ideal for all types of hydraulically steered powerboats — inboards, outboards, stern drives and diesels — or hydraulically steered sailboats. This robust unit gives powerboat users an easy-to-use autopilot system to rely upon for navigation. With its solid-state 9-axis AHRS, Reactor 40 mounts nearly anywhere, in any orientation and requires minimal commissioning. Our patented Shadow Drive technology gives boaters the security of knowing they maintain control, even when relying upon the autopilot.

With its advanced solid-state 9-axis solid-state 9-axis AHRS, you can mount Reactor 40 nearly anywhere, in any orientation. In addition, this new system greatly minimizes heading error, course deviation, rudder movement and power consumption while providing a comfortable ride for all on board.

This amazing autopilot actually reacts to the sea to hold your course. Even when the boat is pitching and rolling, you can remain confident that the Reactor 40 autopilot will keep you on your desired course.

All autopilots require commissioning and calibration — all of them. We know you just want to get on the water, so we made this process as fast and easy as possible. That’s the power of simple.

Combined with a compatible Garmin networked chartplotter, you can have full control of Reactor 40 from wherever you are on the boat. In addition to holding its course in virtually all weather and wind conditions, the system can smoothly perform a variety of preprogrammed trolling and search procedures. Plus, with a compatible Garmin networked chartplotter and BlueChart® g2 Vision® charts (sold separately), you gain optional features such as Auto Guidance , which automatically steers GPS paths.

The Reactor 40 autopilot features patented Shadow Drive technology. This gives you the security of knowing you maintain control, even when the autopilot is engaged. The Shadow Drive system automatically disengages the autopilot if the helm is turned, giving you the freedom to maneuver the boat. The autopilot automatically re-engages when you hold a steady course.

Auto Guidance is for planning purposes only and does not replace safe navigation operations

What's in the Box:

• Reactor 40 CCU (Course Computer Unit)
• ECU (Electronic Control Unit)
• ECU power cable
• Interconnect cable
• Shadow Drive
• Buzzer
• NMEA 2000® drop cables (2 meters)
• NMEA 2000 power cable
• NMEA 2000 T-connectors
• Male and female terminators
• Documentation

SKU: NVN-70459
MPN: 010-00705-21
UPC: 753759207939