B&G Network Autopilot - Manual (Page 16)

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RUDDER REFERENCE UNIT (RRU)
DESCRIPTION
The Rudder Reference Unit (RRU) is a sealed high specification
potentiometer in a robust casing, providing rudder position information
to the Computer Unit. The operating arm is constructed in aluminium
with three positions pre-drilled for the adjustable drag-link. The
drag-link, has ball-joints at each end that connect the unit operating arm
to the tiller arm or steering quadrant. The unit base has four holes to
allow for mounting. The unit is supplied with 10 m/30ft of 3-core
screened cable.