Simrad NAC-D, Руководство по вводу в эксплуатацию

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Drive configuration
The drive configuration controls how the autopilot computer
operates the steering system.
Refer to your drive unit documentation for relevant specifications.
Minimum rudder
Some boats may have a tendency to not respond to small rudder
commands around the “course keeping” position because of a small
rudder, whirls/disturbance of the water-stream passing the rudder,
or it is a single nozzle water jet boat. By increasing the Minimum
rudder parameter you may improve the course keeping
performance on some boats. However, this will increase the rudder
activity.
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Note:
Only set a value for minimum rudder if it proves to give a
better course keeping performance in calm sea. It should be set
after the autopilot steering parameters have been optimised/
tuned.
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Dockside setup | NAC™ -D Commissioning manual