Tech Specs
In The Box
GHC™ 50 helm control display
Yamaha Gateway
CCU cable
Buzzer
NMEA 2000® drop cables (2 meters)
NMEA 2000 power cable
NMEA 2000 T-connectors
Male and female terminators
Documentation
Manual & Warranty
Do you have an old GPS unit lying around? The GPS Nation Trade In and Up program is a great way to trade in your old and used GPS for credit towards a new GPS. The choice is entirely yours! We’ve made the process simple and streamlined. Follow these simple steps, and you will be on your way to receiving credit towards your brand new GPS!
1. Get a quote
To get your free quote, provide your GPS type, manufacturer, model, and condition. Within 24 hours, you will receive a quote for the trade-in value of your current product. The GPS trade-in/trade-up form is at the bottom of this page.
2. Ship your product(s) for trade
After accepting our offer, pack your product(s) safely and ship them to us using the pre-paid shipping label provided to you. We will provide a confirmation email when your trade-in arrives at our warehouse. You have 30 days from the date you complete your on-line trade to ship the product to GPS Nation.
3. Make your purchase
Once we receive your product at our warehouse and we validate the stated condition, we will send you a confirmation email. If you elect to receive credit towards a new GPS at gpsnation.com, your store credit will be issued, and you are free to make your purchase.
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Tech Specs
In The Box
GHC™ 50 helm control display
Yamaha Gateway
CCU cable
Buzzer
NMEA 2000® drop cables (2 meters)
NMEA 2000 power cable
NMEA 2000 T-connectors
Male and female terminators
Documentation
Manual & Warranty
Trade-In
Do you have an old GPS unit lying around? The GPS Nation Trade In and Up program is a great way to trade in your old and used GPS for credit towards a new GPS. The choice is entirely yours! We’ve made the process simple and streamlined. Follow these simple steps, and you will be on your way to receiving credit towards your brand new GPS!
1. Get a quote
To get your free quote, provide your GPS type, manufacturer, model, and condition. Within 24 hours, you will receive a quote for the trade-in value of your current product. The GPS trade-in/trade-up form is at the bottom of this page.
2. Ship your product(s) for trade
After accepting our offer, pack your product(s) safely and ship them to us using the pre-paid shipping label provided to you. We will provide a confirmation email when your trade-in arrives at our warehouse. You have 30 days from the date you complete your on-line trade to ship the product to GPS Nation.
3. Make your purchase
Once we receive your product at our warehouse and we validate the stated condition, we will send you a confirmation email. If you elect to receive credit towards a new GPS at gpsnation.com, your store credit will be issued, and you are free to make your purchase.
Overview
Garmin Reactor 40 Steer-by-Wire Corepack for Yamaha Helm Master With GHC 50 Autopilot Instrument
Introduction
The Garmin Reactor 40 Steer-by-Wire Corepack delivers advanced autopilot control specifically engineered for Yamaha Helm Master systems, combining precision heading hold with integrated steer-by-wire capability. This system enables captains to maintain course accuracy and reduce fatigue during extended passages, while the included GHC 50 display provides dedicated control and monitoring from the helm or remotely via compatible Garmin devices.
Key Features
- Solid-state 9-axis AHRS sensor technology reduces heading errors and power consumption by up to 50% compared to traditional gyro systems
- Heading hold accuracy of ±1 degree maintains consistent course tracking in varied sea conditions and wave heights
- Direct integration with Yamaha Helm Master engine control and joystick steering systems for seamless autopilot activation
- GHC 50 touchscreen display with 1.4-inch color screen for intuitive control and real-time status monitoring
- Wireless remote capability through compatible Garmin chartplotters for operation from anywhere on deck
- Marine-grade construction rated for saltwater environments with sealed connections and corrosion-resistant materials throughout
Data Insights
The Reactor 40's solid-state AHRS system delivers industry-leading course deviation control, maintaining ±1 degree accuracy even during extended transits in rolling seas. The 50% reduction in power consumption over conventional systems significantly extends runtime on battery-powered auxiliary systems and reduces strain on the vessel's electrical architecture. This precision tracking eliminates the constant micro-corrections that wear on mechanical steering components and increase fuel consumption in automated trim systems.
Usage Instructions
Install the autopilot controller and GHC 50 display according to Garmin's marine installation guidelines, ensuring secure mounting and proper NMEA 2000 networking. Calibrate the 9-axis sensor to your vessel's specific heading reference through the GHC 50 menu system. Engage autopilot via the helm control interface or dedicated remote display, and manually verify tracking in open water before relying on automated steering in confined areas. Regular compass rose verification and seasonal recalibration maintain accuracy across varying magnetic environments and vessel load conditions.
Design & Material
The Reactor 40 system combines compact modularity with marine durability, featuring a stainless steel and reinforced polymer enclosure designed to resist corrosion, UV exposure, and vibration. The GHC 50 display integrates flush-mount capability into standard helm cutouts, while the autopilot controller mounts securely below decks with simplified cable routing to Yamaha systems already installed.
- Stainless steel fasteners and marine-grade powder-coated aluminum housing rated for saltwater exposure
- Compact footprint measuring under 8 inches in length for discreet installation in engine rooms and helm lockers
- Sealed connector architecture with IP67-rated connections protecting against spray and accidental washdown
- Conformal coating on circuit boards provides moisture and corrosion resistance in high-humidity marine environments
- Color-coded NMEA 2000 cable integration simplifies installation with existing Yamaha Helm Master networks
- Tactile feedback controls and intuitive menu structure enable full operation even with heavy gloves in rough weather
Final Verdict
The Garmin Reactor 40 Steer-by-Wire Corepack is the precision autopilot solution for captains operating Yamaha Helm Master systems who demand accurate heading control and integrated wireless capability. The ±1 degree accuracy eliminates course hunting, reduces autopilot-related equipment stress, and significantly lowers power consumption during multi-day passages. If your Yamaha-equipped vessel requires sophisticated autopilot automation without replacing existing helm systems, the Reactor 40 delivers proven performance and seamless system integration. Upgrade your steering automation now and navigate with measurable precision.

Garmin Warranty