Overview

The Simrad 000-13900-001 is an A2004 autopilot pack that bundles the helm controller, course computer, rudder feedback, and a solid-state compass sensor for a complete core autopilot setup. At the helm you get the A2004 rotary control head with a 4.1-inch display and a 170 degree viewing angle, while the included RF300 feedback sensor comes with a 10 m cable for routing back to the drive computer.

This kit covers the brains and sensors of the autopilot system, but it does not include a hydraulic pump or mechanical drive unit. The AC70 is the drive computer that connects to the steering drive and clutch, and it also ties in rudder angle feedback so the pilot can steer smoothly and know where the rudder is.

The Precision-9 compass supplies heading and rate-of-turn data on an NMEA 2000 network, and it is IPX7 rated for wet installations. After calibration, the heading accuracy is +/-2 degrees, which is a practical upgrade when you are trying to hold a steady track in wind and tide.

Key features

• A2004 rotary autopilot control head with a 4.1-inch optically bonded color display and a 170 degree viewing angle
• Flush or bracket mounting options for the A2004 at the helm
• Certified NMEA 2000 connectivity for networked autopilot control and heading data sharing
• AC70 autopilot computer drives a rudder using a reversible motor or non-isolated solenoids and supports frequency rudder angle feedback
• AC70 connection for NFU remote control plus one IEC 61162-1 (NMEA 0183) RX/TX channel
• RF300 rudder feedback unit with 10 m cable and link for reliable rudder angle input
• Precision-9 solid-state sensor provides heading, rate of turn, pitch and roll data; IPX7 rated; +/-2 degree heading accuracy after calibration
• Supports autopilot control of a single thruster when paired with an optional interface module (AD80 or SD80)

What's included

• A2004 Rotary Autopilot Head
• AC70 Autopilot Computer
• RF300 Feedback with 10 m cable and link
• Precision-9 Compass

Compatibility and fit

This pack is a strong match for boats that use a dedicated below-decks drive computer and a physical rudder feedback sensor. Plan space at the helm for the A2004, a dry mounting location for the AC70 with access for wiring, and a clean mechanical path at the steering gear for the RF300 to track rudder movement without binding.

The Precision-9 is meant to be installed where it can see stable motion and stay away from magnetic interference. It has a published compass safe distance of 500 mm, so keep it clear of large ferrous masses, speakers, and high-current cabling whenever possible.

Installation and setup

A typical install puts the A2004 at the helm, the AC70 close to the steering drive and power distribution, the RF300 on the rudder stock or quadrant linkage, and the Precision-9 solidly mounted on its bracket. After wiring, expect a dockside setup that includes compass calibration, rudder feedback alignment, and steering response tuning so the pilot matches your hull and steering system.

Electrical and network integration

The Precision-9 connects over NMEA 2000 using a Micro-C port and is powered through the network (8-16 V DC via NMEA 2000, with up to 0.4 W draw). The AC70 adds an IEC 61162-1 (NMEA 0183) RX/TX channel for interfacing where that is still needed, alongside its drive and feedback connections.

Use cases on board

This setup fits helms where the pilot needs to be easy to operate with wet hands, and where steady track keeping matters on long transits, offshore runs, and working routes. It also suits boats that want heading and rate-of-turn data shared on the NMEA 2000 backbone for other onboard systems.

Maintenance and care

Keep connectors supported so vibration does not work them loose, and re-check rudder feedback linkage hardware at the start of each season. If the boat layout changes or you move heavy gear near the sensor, rerun compass calibration so the pilot is not fighting a new magnetic environment.