Simrad NAC-D Autopilot Computer

The Simrad NAC-D Autopilot Computer is the command center every serious boater needs for precision navigation and vessel control. Whether you're running a 20-foot center console or a 60-foot cruiser, this dedicated autopilot processor handles the computational demands of modern marine autopilot systems with reliability you can trust miles from shore.

Built by Simrad—a name synonymous with professional-grade marine electronics—the NAC-D integrates seamlessly into your existing helm setup to deliver hands-free steering that reduces fatigue on long passages and improves fuel efficiency through consistent course-holding. This autopilot computer processes real-time heading data from your compass or GNSS receiver and continuously adjusts rudder servo commands to maintain your preset course, even in variable sea states and cross-currents.

Captains running Simrad's integrated navigation suites will find the NAC-D a natural fit—it works in tandem with Simrad helm displays and autopilot networks. Its architecture supports both rate-based and heading-hold modes, allowing you to dial in the responsiveness that suits your vessel's hull characteristics and sea conditions.