Simrad NAC-3 Autopilot Computer for Vessels Over 10m

The NAC-3 Autopilot Computer is the high‑power brain you rely on when steering large vessels. Designed specifically for boats 10 meters (33 feet) and up, it drives heavy‑duty hydraulic pumps and linear rams, delivering dependable, precise steering while harmonizing with your steering gear and onboard sensors. As the central controller, it runs advanced algorithms that navigate through a wide range of weather and sea states, keeping your helm steady and confident on long passages.

Engineered for demanding loads, the NAC-3 delivers robust drive capability with 30A continuous output and up to 50A peak to power hydraulic drives, mechanical drives, and solenoids. Its flexible power architecture supports 12/24V input, accommodating a wide variety of vessel electrical systems and configurations. This means fewer compatibility headaches when upgrading or retrofitting on larger boats.

Smart control, expandable compatibility

Advanced helm logic leverages B&G Reflex Sailing algorithms to provide proven navigation and helm control, helping you hold course with minimal trim adjustments in shifting winds and seas. The NAC‑3’s solenoid output also supports larger drive configurations, expanding compatibility with bespoke hydraulic or electro‑mechanical setups you may use on custom yachts or workboats.

Seamless data integration for confident navigation

• NMEA data backbone: 1x NMEA 0183 input and 1x output, plus advanced NMEA 2000 rudder‑feedback options to align heading data with modern backbone networks.
• Rudder feedback options: compatible with RF25N and RF300 sensors for accurate, timely corrections in dynamic conditions.
• Flexible control at multiple helm stations: external NFU remotes, external mode input, and external open/close or pulse contacts for SYSTEM SELECT, giving you adaptable control from deck stations.
• Safety alarms: external alarm output (buzzer/relay) keeps crew informed of system status or faults for quick, proactive responses.

Built for the long haul and real-world use

Designed as the centralized autopilot core that links your helm, drive system, and navigation suite, the NAC‑3 is engineered for long‑range passages and heavy helm loads. Its ship‑ready electrical design and sophisticated control algorithms deliver steady, confident autopilot performance across a wide range of weather and sea states.

What you get and how it ships

This Autopilot Core is distributed through Advance Trident with genuine Simrad engineering. Stock is limited, so reach out for current availability and installation readiness to ensure your vessel is ready for immediate deployment.

Ideal use cases and outcomes

Perfect for long voyages where reducing fatigue is a priority, the NAC‑3 maintains course on challenging passages while your crew attends to other tasks. It excels with large hydraulic drives or bespoke electro‑mechanical setups that demand robust current handling, and it bridges older instruments via NMEA 0183 with modern NMEA 2000 networks for a comprehensive, cohesive navigation picture. If your vessel is over 10 meters and your steering demands are high, the NAC‑3 is purpose‑built to deliver steady, reliable autopilot performance.