Meet the Garmin Compact Reactor 40 Hydraulic Autopilot with GHC 50 Instrument Pack — a compact, capable autopilot designed for small craft. Built for hydraulically steered systems, it pairs a rugged hydraulic pump with a smart solid-state 9-axis AHRS, so you can mount it almost anywhere and rely on precise course hold even when the seas are unsettled.
Why choose the Reactor 40 corepack
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Hydraulic autopilot that’s purpose-built for boats less than 25 feet, providing steady course control on single‑engine outboard configurations.
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Solid-state 9-axis AHRS enables flexible mounting in any orientation, while reducing heading error and saving power.
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Fast, simple calibration so you can get on the water quickly and enjoy hands-free cruising.
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Remote control and visibility control your autopilot from anywhere on the boat using compatible Garmin devices, including the GHC 50 helm instrument pack, Reactor autopilot remote, or select quatix marine smartwatches (requires a compatible chartplotter or GHC 50).
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Autopilot with sea‑state awareness reacts to pitching or rolling conditions to keep you on course, giving you extra confidence at speed.
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Shadow Drive compatible optional feature to automatically disengage autopilot when you turn the wheel for manual maneuvering.
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Navigation and performance features when connected to a compatible Garmin chartplotter: heading hold, step turns, wind hold, tack/jibe with a wind sensor, plus follow route and Auto Guidance+ for planning—note Auto Guidance is for planning purposes and does not replace safe navigation.
Designed for simple, reliable installation
The Reactor 40 corepack is easy to install with flexible mounting options and quick commissioning. Its compact footprint fits tight helm spaces (Unit dimensions: 4.3" W x 4.4" H x 1.9" D; Pump: 6.6" L x 3.9" W x 3.3" H) and operates from 10 to 20 V DC, with a wide operating temperature range to handle demanding conditions.
What’s included
- GHC 50 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
Specifications at a glance
- Unit dimensions (W x H x D): 4.3" x 4.4" x 1.9" (10.9 x 11.2 x 4.8 cm)
- Pump dimensions (L x W x H): 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)
Take the helm with confidence—Garmin’s Compact Reactor 40 corepack delivers dependable autopilot performance, seamless Garmin ecosystem integration, and the freedom to enjoy more time on the water.
| 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) |
