Garmin Reactor 40 Mechanical Retrofit Corepack with GHC50Upgrade your boats autopilot with the Garmin Reactor 40 Mechanical Retrofit Corepack with GHC50 a compact, solid state solution for powerboats and sailboats that delivers precise course control in challenging conditions. Solid state 9axis AHRS core: Reliable attitude data for accurate autopilot responses, even in pitching or rolling seas. Broad steering compatibility: Works with direct or cable actuated steering systems and supports class A, class B