Simrad NAC-D User Manual

A Counter rudder value too low; overshoot response
B Counter rudder value is too high; sluggish and creeping
response
C Correct setting of Counter rudder; ideal response
Perform various course changes and observe how the boat settles
on the new heading. Start with small changes, 10-20 degrees, and
proceed with bigger changes, 60-90 degrees. Adjust Counter rudder
value to obtain best possible response as in illustration C.
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Note: As many boats turns differently to port versus starboard
(due to propeller rotation direction), do the course changes in
both directions. You may end up with a compromise setting of
Counter rudder that gives a little overshoot to one side and a
bit creeping response to the other.
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Sea trial | NAC™ -D Commissioning manual

Simrad NAC-D Specifications

General

Brand	Simrad
Model	NAC-D
Category	Autopilot System
Language	English