The Garmin Reactor 40 Mechanical Retrofit Corepack (No GHC Control) is a compact, below-deck autopilot corepack designed for both sailboats and powerboats. It delivers precise steering with minimal setup and flexible compatibility, without needing the GHC control module.
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Versatile steering compatibility: Ideal for direct or cable-actuated steering systems, including hydraulic, cable drive, mechanical, and solenoid configurations. Pair with GRF 10 for broad drive compatibility.
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Multi-boat functionality: Supports both sailing and powerboat modes, with features like heading hold, wind hold, step turns, and tack/jibe for confident control.
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Below-deck, compact design: Keeps installation tidy while delivering dependable autopilot performance—an extra set of hands to manage sails, lines, winches, and radios.
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Sea-aware steering: The autopilot reacts to sea conditions to hold your course even as the boat pitches and rolls, improving stability and comfort on longer passages.
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Smart integration: When paired with a compatible Garmin networked chartplotter, you can control Reactor 40 from anywhere on the boat and run preprogrammed trolling and search procedures.
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Optional Auto Guidance with BlueChart g2 Vision: Optional navigation enhancement that automatically steers GPS paths to optimize routes (sold separately).
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Shadow Drive compatibility: For hydraulic installations, add-on Shadow Drive technology provides an extra layer of security, helping you maintain control in challenging conditions.
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Easy setup and commissioning: Designed for quick commissioning and calibration, with flexible mounting that works in many orientations.
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Dimensions and electrical specs: CCU dimensions 4.3" x 4.4" x 1.9" (10.9 x 11.2 x 4.8 cm); ECU dimensions 6.6" x 4.6" x 2.1" (16.8 x 11.7 x 5.3 cm). Supply voltage 10–30 V; operating temperature -15°C to 60°C; maximum sustained motor current 15 A; maximum instantaneous motor current 40 A; maximum clutch current 2.5 A (for higher current, a relay must be added to the clutch circuit).
This corepack helps you manage steering with less effort, stabilizes your ride across seas, and integrates with Garmin gear for automated routes and remote control from the boat. Its compact, adaptable design means you can upgrade or install it on a wide range of vessels without a major overhaul.
| CCU dimensions |
4.3 " x 4.4 " x 1.9 " (10.9 x 11.2 x 4.8 cm) |
| ECU dimensions |
6.6 " x 4.6 " x 2.1 " (16.8 x 11.7 x 5.3 cm) |
| Supply voltage |
10 V to 30 V |
| Operating temperature |
-15° C to 60 C° (5° F to 140° F) |
| Maximum sustained motor current |
15A |
| Maximum instantaneous motor current |
40A |
| Maximum clutch current |
2.5A (for drives requiring higher current than 2.5A, a relay needs to be added to the clutch circuit) |