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Simrad NAC-D Autopilot Computer f/Steer By Wire
The Simrad NAC-D Autopilot Computer delivers digital steering integration for US drive-by-wire vessels, featuring specialized software for Volvo EVC, Yamaha, and SeaStar Optimus systems.
- Display: MFD Integration Required
- Network: Dual NMEA 2000
- Technology: Steer-By-Wire Digital Interface
- Voltage: 12V/24V DC Input
- Rating: IPX5 Waterproof Housing
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Description
Steer-By-Wire and Gateway Analysis
Digital steering architectures require specialized data translation to prevent signal latency between the helm and engine actuators. The Simrad NAC-D Autopilot Computer is designed specifically for Steer-By-Wire systems. This unit manages steering commands via a digital CAN bus interface.
Integration occurs through the NMEA 2000 network for high-speed data exchange with MFDs and engine gateways. The computer supports proprietary protocols including Volvo Penta, Yamaha, and Mercury digital steering. The solid-state design meets IPX5 environmental standards for protected cabin installations.
Strategic Vessel Application
Required for modern vessels equipped with digital steer-by-wire engines requiring an integrated Simrad autopilot solution.
Technical Key Features
- Digital bus interface enables steer by wire
- CAN bus protocol ensures zero latency commands
- NMEA 2000 certified for universal system telemetry
- Supports Volvo Yamaha and Mercury digital steering
- Solid state technology eliminates mechanical drive wear
- IPX5 rated housing protects internal processor circuitry
- Automatic gain control optimizes digital steering response
SIMRAD NAC-D Autopilot Computer f/Steer By Wire Specifications
| Drive Type | Digital Steer-By-Wire Interface |
| Pump/Ram Capacity | Direct Digital Link (No Pump) |
| Flow Rate / Speed | Ultra-Low Latency Signal |
| Max Pressure | Electronic Torque Control |
| Cylinder Compatibility | Digital Steering Systems Only |
| Operating Voltage | 9V - 31.2V DC Wide Range |
| Peak Current Draw | Digital Signal Level Only |
| Average Power Draw | < 150mA Typical Load |
| Motor Type | Solid State Digital Processor |
| Computer Compatibility | NAC-D SBW Controller |
| Port Size / Thread | NMEA 2000 Micro-C Connection |
| Drive Connection | CAN-Bus / Digital Interface |
| Rotation/Stroke Direction | Byte-Level Digital Precision |
| Mounting Type | Slim-Profile Bulkhead Mount |
| Housing Material | UV-Stabilized Polycarbonate |
| Waterproof Rating | IPX7 Fully Submersible Grade |
| Operating Temperature | -25°C to +55°C Performance |
| Length (Overall) | 170 mm Slim Chassis |
| Width/Diameter | 145 mm Digital Core |
| Weight | 0.4 kg Ultra-Lightweight |
| Included Accessories | Network Termination Kit |
| Key Mechanical Feature | Integrated Digital Drive Gateway |
Simrad NAC-D Steer-By-Wire Computer Technical Guide
The NAC-D is a specialized autopilot computer for Steer-By-Wire (SBW) propulsion systems, including Dometic (Teleflex) Optimus, Yamaha Helm Master, and Volvo Penta EVC. It bridges the gap between Simrad’s navigation logic and the engine's digital steering system, eliminating the need for hydraulic pumps and mechanical rudder sensors.
The NAC-D features dual NMEA 2000 ports to isolate the navigation network from the engine's critical steering data bus. It translates autopilot commands into digital steering pulses that the engine's actuators understand. This results in incredibly fast, precise steering corrections that are perfectly synchronized with the propulsion system.
Yes, the NAC-D requires a high-performance heading sensor like the Precision-9 to provide accurate rate-of-turn and motion data. Because SBW systems are highly responsive, a stable 9-axis sensor is critical to prevent over-steering and to ensure the vessel maintains a smooth track during high-speed transit.
On multi-engine boats, the NAC-D manages the steering of all engines simultaneously through the digital controller. It allows for advanced maneuvering features and provides the pilot with precise control from either a dedicated AP44 controller or a networked Simrad MFD. It simplifies the helm by removing bulky hydraulic hoses.
Commissioning is performed via the Simrad MFD or AP44 controller using a dedicated Steer-By-Wire setup wizard. The NAC-D automatically detects the propulsion system's parameters and calibrates the steering limits digitally. This process is much faster than traditional hydraulic bleeding and physical sensor alignment.
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