Course Computer Unit – Reactor 40 for Volvo-PentaGarmin’s CCU is the brain of the Reactor 40 autopilot system, containing sensory equipment used to determine heading and rate of turn. Connect the CCU to the NMEA 2000 network to communicate with your GHC 20 and an optional NMEA 2000-compatible devices.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.