Simrad NAC-3 High Current Course Computer [000-13250-001]NAC 3 High Current Course Computer The NAC 3 Autopilot Computer is the brains behind your Simrad autopilot system. It contains the electronics needed to operate a hydraulic steering pump or mechanical drive unit, while also interfacing with other components including heading sensors and rudder feedback units. The NAC 3 was designed for boats 10M (33') or greater in length and is rated to operate high current pumps, mechanical drive units, and solenoid