Manual: Simrad Rf300 Installation

Attach the ball joint to the rudder tiller arm at the 140 mm radius point.

Which (e.g., NAC-2, NAC-3, AC12, or AC42) you are connecting the unit to. simrad rf300 installation manual

This is the most critical step for performance. The RF300 transmitter arm has two slots to allow for a precise 1:1 mechanical linkage relationship. Attach the ball joint to the rudder tiller