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If the autopilot is not keeping the heading satisfactorily or not

making the turns satisfactorily, you may now either try the Autotune

function or go directly to manual tuning.

Note: If the vessel is more than approximately 30 m/100 ft or

has a very high cruising speed it may be unpractical to perform

Autotune. It is then suggested to proceed with manual tuning.

Autotuning

When performing an autotune, the vessel will automatically be

taken through a number of S-turns. Based on the vessel behavior,

the autopilot will automatically set the most important steering

parameters (Rudder gain and Counter rudder).

• Stabilize the vessel on a heading and set the speed between 5-10

kn, then select Autotune.

- The autopilot will now switch to AUTO mode and take control

of the vessel.

Note: Autotuning can be stopped at any time by pressing the

STBY key on the autopilot controller.

The autotuning takes approximately 3 minutes to complete. When

completed the autopilot automatically switches to Standby mode,

and the rudder must be controlled manually.

Note:

All parameters that are set during autotuning can be

manually adjusted. For optimal steering performance it is

recommended to manually adjust the steering parameters after

running the autotune.

Manual tuning

Rudder gain and Counter rudder can be manually adjusted.

• Stabilize the vessel on a heading and set the speed in the middle

of the profile range (well clear of the transition speed) to avoid

profile switching during tuning. Then activate the Rudder gain

option. Adjust the value according to the descriptions below.

• If required, adjust slightly the Counter rudder option.

Sea trial | NAC™ -D Commissioning manual

Simrad NAC-D User Manual

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