Garmin Compact Reactor 40 Hydraulic Autopilot w/GHC 20 Corepack
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Garmin Compact Reactor 40 Hydraulic Autopilot w/GHC 20 Corepack Product Description
Imagine cruising your single-engine outboard boat under 30 feet without the constant strain of gripping the wheel through choppy waves or long open-water stretches. The Garmin Compact Reactor 40 Hydraulic Autopilot with GHC 20 Corepack steps in as your reliable co-pilot, letting you focus on the horizon, your passengers, or even a quick fishing cast. This entry-level system shines at moderate to high speeds, delivering smooth, precise course-holding that transforms tiring steers into effortless adventures.
Precision Steering Powered by Advanced AHRS Technology
At the heart of this autopilot lies a solid-state 9-axis Attitude Heading Reference System (AHRS). Unlike older sensors prone to drift, this gyro-stabilized setup reads pitch, roll, yaw, and more in real-time. The result? Razor-sharp heading accuracy that cuts down on rudder swings, power draw, and those annoying course wobbles—even in rough seas. Boaters report feeling the difference immediately: less fatigue, steadier rides, and fuel savings from efficient steering.
Flexible mounting means you can tuck the compact course computer unit (CCU) almost anywhere, from tight console spaces to bulkheads. No more wrestling with bulky gear during install—it's designed for weekend warriors who want pro-level performance without the hassle.
Seamless Response to Real-World Boating Conditions
Sea conditions don't play nice, but this autopilot does. It dynamically adjusts to boat motion, holding your line through swells and crosswinds. Picture motoring across a bay with wind gusts trying to push you off course—the Reactor 40 counters it instinctively, keeping everyone aboard comfortable and on track. It's not just holding a heading; it's anticipating the water's moods for a ride that feels intuitive and secure.
Quick Setup: From Box to Water in Record Time
Forget hours of tweaking and sea trials. Commissioning and calibration boil down to straightforward steps via the intuitive GHC 20 helm control display. Connect the components, run a short dockside procedure, and you're ready to test on the water. Many users complete full installs in under a day, thanks to color-coded cables and plug-and-play NMEA 2000 networking. It's boating simplified, so you spend more time enjoying waves than wiring.
Full-System Integration for Smarter Boating
Hook it into your Garmin ecosystem, and the magic multiplies. Control steering right from compatible chartplotters—no extra screens needed. Share heading data across NMEA 2000 devices for radar overlays, MARPA target tracking, and even pre-set trolling patterns (though for heavy trolling, consider upgrades). Add up to three GHC 20 units around the boat for multi-station control, or grab a wireless remote for flybridge freedom.
While Shadow Drive isn't included here, its optional tech lets you override instantly by turning the wheel, then auto-reengage on steady course—perfect for sudden maneuvers without fumbling buttons.
Built Tough for Everyday Marine Life
Rated from -15°C to 70°C, this system laughs off salt spray, humidity, and vibrations. The 1.0L hydraulic pump pairs perfectly with smaller outboards, delivering responsive power without overkill. Operating on 10-20V, it plays nice with typical boat batteries, sipping energy for all-day reliability.
What's Included for a Complete Corepack
- GHC 20 helm control display for straightforward operation
- Reactor 40 CCU for brains of the operation
- 1.0L hydraulic pump for precise rudder control
- ECU with power cable
- Interconnect and NMEA 2000 cables (including drops, power, T-connectors, terminators)
- Buzzer for alerts
- Full documentation
Key Specifications at a Glance
| Feature | Details |
|---|---|
| Unit dimensions (WxHxD) | 4.3" x 4.4" x 1.9" (10.9 x 11.2 x 4.8 cm) |
| Pump dimensions (LxWxH) | 6.6" x 3.9" x 3.3" (16.8 x 10.0 x 8.5 cm) |
| NMEA output | NMEA 2000 |
| Supply voltage | 10V to 20V |
| Operating temperature | -15°C to 70°C (5°F to 158°F) |
Pro Tip: Ideal for day cruises and coastal runs on outboards, but for low-speed trolling or fishing holds, step up to higher Reactor models for extra precision.
Frequently Asked Questions
What boats is the Garmin Compact Reactor 40 with GHC 20 best suited for?
It's optimized for single-engine outboard boats under 30 feet, excelling at moderate to high-speed cruising where steady hands-free steering makes all the difference.
How does the 9-axis AHRS improve autopilot performance?
The solid-state 9-axis AHRS tracks multiple axes of motion for superior heading stability, reducing errors, power use, and discomfort in varying sea states compared to traditional sensors.
Is installation complicated for this autopilot?
No—minimal commissioning and calibration, plus flexible mounting and NMEA 2000 plug-and-play, make it approachable for DIY boaters with basic tools.
Can I control it from my Garmin chartplotter?
Yes, it integrates seamlessly via NMEA 2000 with compatible Garmin chartplotters, allowing full control, data sharing, and features like radar overlays.
What's the benefit of multiple GHC 20 displays?
Connect up to three for control from different helm stations, giving flexibility on larger small boats or multi-area setups.
Does it work in rough water?
Absolutely—the system reacts to pitching and rolling, maintaining course even in choppy conditions for a confident, comfortable ride.
Is Shadow Drive included in this corepack?
This pack focuses on essentials, but Shadow Drive is available as an optional add-on for automatic disengage/reengage during manual overrides.
Compact Reactor 40 Hydraulic Autopilot with GHC 20 Corepack
Ideal Entry-level Autopilot System
- Includes Compact Reactor 40 starter pack and GHC 20 marine autopilot control unit
- Recommended only for single-engine outboard boats less than 30' long
- 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
Designed for boats less than 30' long, the Compact Reactor 40 hydraulic autopilot provides relief from manually holding the wheel to maintain course, especially when cruising at moderate to high speeds. Sit back at the helm, and enjoy your time on the water as the solid-state 9-axis AHRS technology delivers a comfortable ride.
Offered in 3 different corepacks, this autopilot lets you configure your autopilot setup, depending on the features you need and how much you want to spend. Buy the starter pack (compatible chartplotter required), add a GHC 20 marine autopilot control unit, or add both GHC 20 and the Shadow Drive attachment.
The autopilot is easy to install with flexible mounting options and quick, easy commissioning. Choose a corepack with our patented Shadow Drive technology, and simply turn the wheel to take control of the helm; hold a constant course to re-engage. It integrates with compatible Garmin electronics to control the autopilot from the chartplotter display. And it can be engaged to follow an Auto Guidance path (requires LakeV HD Ultra maps or BlueChart g2 Vision HD charts).
Solid-state 9-axis AHRS
With its advanced solid-state 9-axis AHRS, Compact Reactor 40 provides you with more flexible mounting options. In addition, this 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 Compact Reactor 40 autopilot will keep you on your desired course.
Minimal Commissioning and Calibration
All autopilots require commissioning and calibration to work properly. 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 Electronics
Combined with our compatible networked electronics, you can have full control of Compact 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 BlueChart g2 Vision HD charts (sold separately), you gain optional features such as Auto Guidance, which automatically steers GPS paths.
Stay in Control with Optional Shadow Drive Technology
The Compact Reactor 40 autopilot supports optional 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.
Connect to Networked Devices
Compact Reactor 40 can be operated using the included GHC 20 helm control unit. In fact, you can connect up to 3 GHC helm control units. You can also operate it directly from your compatible Garmin chartplotter screen. GHC communicates with the autopilot system via your NMEA 2000 network, so autopilot heading data can be shared easily with other devices. This enables MARPA and chart overlay when connected to a Garmin radar and chartplotter. An optional handheld wireless remote control is also available.
In The Box:
- GHC 20 helm control display
- Reactor 40 CCU (Course Computer Unit)
- 1.0 L Pump
- ECU (Electronic Control Unit)
- ECU power cable
- Interconnect cable
- Buzzer
- NMEA 2000 drop cables (2 meters)
- NMEA 2000 power cable
- NMEA 2000 T-connectors
- Male and female terminators
- Documentation
Not recommended for fishing or applications that require holding heading while trolling or at low speeds. For applications that require precise heading control while trolling or at low speeds, our higher-performance Reactor 40 models are recommended.
Requires echoMAP CHIRP 5x/7x/9x chartplotter/sonar combos; ECHOMAP Plus 6x/7x/9x chartplotter/sonar combo; GPSMAP chartplotter series 7200/7400/7600/8000/8200/8400/8500/8600; or GPSMAP chartplotter/sonar combo series 7x2/9x2/10x2/12x2
Auto Guidance is for planning purposes only and does not replace safe navigation operations.
Model: 010-00705-07
- Includes Compact Reactor 40 starter pack and GHC 20 marine autopilot control unit
- Recommended only for single-engine outboard boats less than 30’ long
- 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
Designed for boats less than 30’ long, the Compact Reactor 40 hydraulic autopilot provides relief from manually holding the wheel to maintain course, especially when cruising at moderate to high speeds . Sit back at the helm, and enjoy your time on the water as the solid-state 9-axis AHRS technology delivers a comfortable ride.
Designed for boats less than 30’ long, the Compact Reactor 40 hydraulic autopilot provides relief from manually holding the wheel to maintain course, especially when cruising at moderate to high speeds . Sit back at the helm, and enjoy your time on the water as the solid-state 9-axis AHRS technology delivers a comfortable ride.
With its advanced solid-state 9-axis AHRS, Compact Reactor 40 provides you with more flexible mounting options. 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 Compact Reactor 40 autopilot will keep you on your desired course.
All autopilots require commissioning and calibration to work properly. 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.
The Compact Reactor 40 autopilot supports optional 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.
Compact Reactor 40 can be operated using the included GHC 20 helm control unit. In fact, you can connect up to 3 GHC helm control units. You can also operate it directly from your compatible Garmin chartplotter screen. GHC communicates with the autopilot system via your NMEA 2000® network, so autopilot heading data can be shared easily with other devices. This enables MARPA and chart overlay when connected to a Garmin radar and chartplotter. An optional handheld wireless remote control is also available.
1Not recommended for fishing or applications that require holding heading while trolling or at low speeds. For applications that require precise heading control while trolling or at low speeds, our higher-performance Reactor 40 models are recommended.
2Requires echoMAP™ CHIRP 5x/7x/9x chartplotter/sonar combos; ECHOMAP Plus 6x/7x/9x chartplotter/sonar combo; GPSMAP® chartplotter series 7200/7400/7600/8000/8200/8400/8500/8600; or GPSMAP chartplotter/sonar combo series 7x2/9x2/10x2/12x2
3Auto Guidance is for planning purposes only and does not replace safe navigation operations.
Specifications| Unit dimensions, WxHxD | 4.3 " x 4.4 " x 1.9 " (10.9 x 11.2 x 4.8 cm) |
| Pump dimensions, LxWxH | 6.6 " x 3.9 " x 3.3 " (16.8 x 10.0 x 8.5 cm) |
| NMEA output | NMEA 2000 |
| Supply voltage | 10V to 20V |
| Operating temperature | -15° C to 70 C° (5° F to 158° F) |
What's in the Box:
- GHC 20 helm control display
- Reactor 40 CCU (Course Computer Unit)
- 1.0 L Pump
- ECU (Electronic Control Unit)
- ECU power cable
- Interconnect cable
- Buzzer
- NMEA 2000® drop cables (2 meters)
- NMEA 2000 power cable
- NMEA 2000 T-connectors
- Male and female terminators
- Documentation
The Compact Reactor 40 hydraulic autopilot equipped with GHC 20 Corepack is specially designed for ships less than 30 feet in length. It can reduce the pressure of manually holding the wheels to maintain the heading, especially at medium speeds to When driving at high speed. The solid 9-axis AHRS technology provides a comfortable riding experience, allowing you to sit back and relax and enjoy time on the water. The autopilot offers 3 different core packages that allow you to configure the autopilot settings, depending on the required functions and the required cost. Purchase a starter kit (compatible chartplotter is required), add GHC 20 marine autopilot control unit, or add GHC 20 and Shadow Drive accessories at the same time.
SKU: NVN-69273
MPN: 010-00705-07
UPC: 753759189334
Frequently Asked Questions (FAQ) About Garmin Compact Reactor 40 Hydraulic Autopilot w/GHC 20 Corepack
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Garmin Compact Reactor 40 Hydraulic Autopilot w/GHC 20 Corepack Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Garmin |
| Weight: |
13.7 lb |
| Steering Type: |
Hydraulic |
| Categories v2: |
Marine Navigation & Instruments | Autopilots |
| Category v1: |
AUTOPILOTS |
| UPC: |
753759189334 |
Garmin Compact Reactor 40 Hydraulic Autopilot w/GHC 20 Corepack User Reviews
Garmin Compact Reactor 40 Hydraulic Autopilot w/GHC 20 Corepack Shipping & Return
| Shipping Weight: |
13.7 lb |
|---|---|
| Box Sizes: |
11.00 (h) x 16.00 (w) x 13.00 (l) |
| Cubic Feet: |
2288.0 |
| Returnable: |
Yes |
| USPS First Class: |
Yes |
| Oversize Item: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.