Simrad NAC-D, Commissioning Manual

Page: 22 / 34

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
.
Ú
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