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Simrad NAC-2 VRF Core Pack – NAC-2, Precision-9 & N2k Starter Kit
The Simrad NAC-2 VRF Core Pack delivers reliable heading control for US vessels up to 35 feet, featuring a Precision-9 compass and Virtual Rudder Feedback technology.
- Display: MFD Integration Required
- Network: NMEA 2000 Certified
- Technology: Virtual Rudder Feedback
- Voltage: 12V/24V DC Input
- Rating: IPX5 Waterproof Computer
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Description
Medium Current VRF and Compass Analysis
Standard autopilot installations are frequently compromised by the mechanical failure of rudder reference units in restricted spaces. The Simrad NAC-2 VRF Core Pack utilizes Virtual Rudder Feedback to calculate position without sensors. This processor supports medium-current drives up to 12 amps.
The package includes a Precision-9 compass for 2-degree heading accuracy and multi-axis motion compensation. Telemetry is distributed via the NMEA 2000 backbone to ensure zero-latency data transfer. The compact processor footprint facilitates installation in dry compartments or consoles.
Strategic Vessel Application
Essential for boats up to 35 feet utilizing medium-capacity hydraulic pumps or linear drive units.
Technical Key Features
- NAC 2 processor supports 12 amp current
- Precision 9 compass delivers 9 axis motion
- VRF algorithms eliminate physical rudder feedback hardware
- NMEA 2000 certified for high speed telemetry
- Low power consumption extends vessel battery life
- Compact housing simplifies restricted space hardware mounting
- Solid state technology ensures long term reliability
SIMRAD NAC-2 VRF Core Pack Specifications
| Drive Type | Medium Current Autopilot Computer |
| Pump/Ram Capacity | Supports RPU80 / RPU160 Units |
| Flow Rate / Speed | 8A Continuous / 16A Peak Output |
| Max Pressure | Standard Hydraulic System Support |
| Cylinder Compatibility | Up to 15 cu in (250cc) Volume |
| Operating Voltage | 12V / 24V DC System |
| Peak Current Draw | 16A Current Limit |
| Average Power Draw | 140mA (Standby Controller) |
| Motor Type | Digital H-Bridge Controller |
| Computer Compatibility | NAC-2 Core Processor Unit |
| Port Size / Thread | Screw Terminal Connectivity |
| Drive Connection | Hard-Wired to Drive Unit |
| Rotation/Stroke Direction | Software Controlled Reversing |
| Mounting Type | Bulkhead Vertical/Horizontal |
| Housing Material | Ruggedized Marine Polymer |
| Waterproof Rating | IPX5 Splash Resistant |
| Operating Temperature | -25°C to +55°C Industrial Grade |
| Length (Overall) | 204 mm Compact Profile |
| Width/Diameter | 180 mm Standard Unit |
| Weight | 0.6 kg (1.3 lbs) Lightweight |
| Included Accessories | Precision-9 Compass, N2K Kit |
| Key Mechanical Feature | Virtual Rudder Feedback (VRF) Logic |
Simrad NAC-2 VRF Core Pack Technical Guide
The NAC-2 is a medium-current autopilot computer optimized for vessels up to 35 feet. It delivers up to 8 Amps of continuous current (16 Amps peak), making it the perfect match for Type 1 hydraulic pumps and low-power mechanical drives. It is widely used in center consoles and mid-sized sailing yachts.
By utilizing Virtual Rudder Feedback, the NAC-2 eliminates the need for mechanical linkages between the engine and a sensor. This is ideal for boats with limited space in the motor well. The system calibrates itself during a brief sea trial, learning the vessel's response to the hydraulic pump's activity to maintain a precise heading.
The Precision-9 provides the NAC-2 with high-speed (20Hz) heading and motion data. This allows the autopilot to make faster and more subtle corrections than traditional fluxgate compasses, leading to a smoother ride and better fuel efficiency. The 9-axis sensor is also used to provide stable heading data for radar overlay on your MFD.
The NAC-2 operates on 12V or 24V DC. It requires a 12-gauge power wire and should be protected by a 20A fuse. Ensure the NMEA 2000 network is powered from a stable 12V source to prevent data drops between the computer and the compass. The NAC-2 is designed for bulkhead mounting in a dry, ventilated location.
Yes, when networked with a Simrad or B&G MFD and a compatible depth transducer, the NAC-2 can automatically steer the boat along a specific depth contour. This feature is highly valued by anglers for trolling along drop-offs or reefs. The "VRF" pack supports all standard Simrad steering patterns.
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