Simrad RF25N Rudder Feedback Unit, NMEA 2000 Micro-C, ±120°, ±0.5°

Overview

The Simrad 000-10756-001 is a rotary rudder feedback sensor that puts real-time rudder angle onto an NMEA 2000 network for autopilot steering systems. It covers a ±120 degree rudder travel and reports with ±0.5 degree accuracy, so the pilot can steer from actual rudder position instead of guessing.

This is the Micro-C version (1 LEN) and it draws about 40 mA from the backbone. The sensor body is compact at 99 x 65 x 177 mm and can be mounted horizontal, vertical, or upside down, which helps when you are working around tight steering gear spaces.

Key features

• NMEA 2000 Micro-C connectivity and rudder angle output on PGN 127245

• ±120 degree measurement range for common rudder systems

• Accuracy rated to ±0.5 degrees (±0.25 degrees within ±5 degrees)

• Low network load: 1 LEN, about 40 mA draw from the backbone

• Compact housing (99 x 65 x 177 mm) with flexible mounting orientation

• Supplied with a transmission link for mechanical connection to the tiller arm or quadrant

What’s included

• RF25N rudder feedback sensor with attached Micro-C cable

• Stainless transmitter link with ball joints (345 mm)

• Mounting screws

Compatibility and fit

This unit is meant for boats with a mechanical rudder arm or quadrant where the autopilot needs rudder angle feedback. It connects to an NMEA 2000 backbone using a Micro-C drop connection; plan on an open T-connector near the steering gear and a properly powered, terminated network. Any compatible device on the network that supports rudder angle data can use it as part of autopilot setup and steering control.

Installation and setup

Mount the sensor close to the rudder post and keep the sensor centerline aligned with the rudder post center. The linkage should move freely through full rudder travel without binding, and the mechanical geometry is intended to be a 1:1 relationship between rudder movement and the sensor lever travel. The transmitter lever is factory adjusted and is not intended to be removed during installation.

The rudder arm connection uses a stud that is installed into a drilled and tapped hole (4.2 mm drill and 5 mm tap). If space is limited, the transmitter rod length can be trimmed so the sensor can sit closer to the rudder post while keeping clean linkage movement.

On-board use and upkeep

This is a good match for cruising sailboats and powerboats where the autopilot is expected to hold a steady course in quartering seas or during long runs, and where predictable rudder feedback helps reduce hunting. After installation, re-check fasteners after a few trips and keep the linkage area free of stored gear so nothing interferes with full rudder travel.

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