Overview

The Simrad 000-13337-001 is a NAC-2 VRF Core Pack that bundles the NAC-2 autopilot computer, a Precision-9 compass sensor, and a Micro-C NMEA 2000 backbone starter kit for outboard and sterndrive boats up to 10 m (35 ft).

This is the below-decks core of a Simrad autopilot system. Add a drive unit that matches your steering system and run control from a Simrad autopilot controller or a compatible Simrad multifunction display over the NMEA 2000 network.

The NAC-2 is built around 12/24 V DC systems and can drive low-current pumps and drives up to 8 A continuous (12 A peak). Precision-9 connects on the NMEA 2000 backbone and supplies heading and rate-of-turn data with ±2° heading accuracy after calibration, with an IPX7 rating that supports exposed mounting when that suits the boat.

Key features

• Core pack format with NAC-2 autopilot computer, Precision-9 sensor, and Micro-C NMEA 2000 backbone hardware in one box
• Recommended for outboard and sterndrive installations up to 10 m (35 ft)
• Virtual Rudder Feedback support for simplified installs where a mechanical rudder feedback sensor is impractical
• NAC-2 drive capability for low-current hydraulic pumps, mechanical drives, hydraulic linear drives, and solenoid valves (8 A continuous, 12 A peak)
• Precision-9 outputs heading and rate-of-turn plus pitch and roll over NMEA 2000, with ±2° heading accuracy after calibration
• Ingress ratings that suit real boat environments: NAC-2 rated IPX5 and Precision-9 rated IPX7

What’s included

• NAC-2 autopilot computer
• Precision-9 compass sensor
• Micro-C backbone kit with network power cable, 4.5 m network cable, three T-connectors, and two 120 ohm network terminators

Compatibility and fit

This core pack is intended for outboard and sterndrive (inboard/outboard) steering systems and is commonly paired with low-current drive pumps and compact mechanical or linear drives. It also supports rudder feedback sensor inputs for steering systems that require physical feedback.

Network integration is NMEA 2000 via Micro-C connectors. If your boat already has an NMEA 2000 backbone, the included hardware can be used to expand it or to build a dedicated backbone for the autopilot and tie it into the existing network.

Installation and setup

Plan for a protected below-deck mounting location for the NAC-2, away from bilge water and with room to route the drive wiring and network cabling cleanly. Keep drive wiring runs sensible for voltage drop, and separate high-current drive wiring from sensitive signal and network cabling where possible.

Precision-9 placement matters for heading quality. Mount it where it will see minimal magnetic disturbance from engines, speakers, tool storage, and high-current cabling, and allow about 500 mm (1.7 ft) compass-safe separation. Once installed, the guided compass calibration and auto-tuning routines handle most of the setup work during dockside checks and sea trial.

Use on board

This setup suits skippers who want a networked autopilot foundation for coastal runs and day trips, with control at the helm through a dedicated pilot controller or a Simrad display. It is also a practical starting point for fishing boats and small cruisers where steady course-keeping helps during long transits and when running a consistent track.