Both user settings and installation settings depends on which
autopilot computer that is connected to the system.
The following sections describe the settings that can be changed by
the user. The settings are described per autopilot computer.
Installation settings are available in the documentation following
the autopilot computers.
NAC-2/NAC-3 Autopilot computer
Steering (NAC-2/NAC-3)
These options allow for manually changing parameters that were
set during the commissioning of the autopilot computer. For more
details, refer to the separate documentation for the autopilot
computer.
• Turn rate: Preferred turn rate used while turning in degrees per
minute
• Rudder gain: This parameter determines the ratio between
commanded rudder and the heading error. The higher rudder
value the more rudder is applied. If the value is too small it will
take a long time to compensate for a heading error, and the
autopilot will fail to keep a steady course. If the value is set too
high the overshoot will increase and the steering will be
unstable.
• Counter rudder: Relation between change in heading error and
applied rudder. Higher counter rudder will reduce applied rudder
faster when approaching the set heading
• Autotrim: Controls how aggressively the autopilot will apply
rudder to compensate for a constant heading offset, e.g. when
external forces such as wind or current affects the heading.
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Autopilot | IS42 Operator Manual
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