Introducing the Garmin Reactor 40 Autopilot Steer-by-Wire Corepack (Standard Corepack Without GHC). Built for both powerboats and sailboats, this advanced autopilot system delivers ultra-responsive steering control when integrated with SeaStar Optimus systems, Yanmar ZT 370 stern drives with electronic power steering, or ZF 2800 Pod drives. The Reactor 40 combines simplified commissioning with robust, steer-by-wire autopilot performance to transform your time on the water.

Why engineers and skippers choose Reactor 40

• Solid-state 9-axis AHRS minimizes heading error, course deviation, and rudder movement while reducing power consumption for a smoother, more efficient ride.
• Mounts nearly anywhere in any orientation thanks to its advanced attitude reference system, giving you flexible installation options on almost any vessel.
• Minimal commissioning and calibration—get on the water quickly with a setup that’s designed to be fast and simple.
• Reactor 40 delivers very responsive autopilot performance, reacting to sea state to hold your course even as the boat pitches and rolls.
• Versatile for both powerboats and sailing with features like heading hold, wind hold, tack/jibe, and step turns in all corepacks.
• Full control from your Garmin network—pair with a compatible chartplotter to manage Reactor 40 from anywhere on the boat.
• Optional Auto Guidance (BlueChart g2 Vision charts sold separately) automatically steers GPS paths for planning purposes. Note: Auto Guidance is for planning and does not replace safe navigation operations.
• Compatibility with SeaStar Optimus, Yanmar ZT 370 stern drive electronic power steering, and ZF 2800 Pod drives ensures broad marine applicability.

Build, durability and performance

• IPX7 waterproof rating and a fully gasketed, high-impact plastic case for demanding marine environments.
• Operational in a wide temperature range from 5°F to 131°F (-15°C to 55°C).
• Compact CCU with 3 19/32 in diameter (91.4 mm) footprint and a 9.5 ft (3 m) CCU cable for flexible placement.
• NMEA 2000 power input (9–16V) and LEN 3 (150 mA) ensure seamless integration with your boat’s network.

What’s in the box

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