User settings
The user settings can be configured differently between the
different profiles, depending on boat steering characteristics and
user preferences.
Steering profile settings
The NAC-2 and NAC-3 include two steering profiles (High and Low),
used for high and low boat speed.
The initial parameters are automatically assigned when you select
your vessel type. During the seatrial the parameters will be tuned for
optimized steering performance. See "Tuning the autopilot" on page 18.
The options listed in the next pages are available for both High and
Low speed profiles.
For Rudder gain and Counter rudder, see "Rudder gain" on page 21 and
"Counter rudder" on page 21.
Turn rate
Used for manually setting the turn rate defined during seatrials (Set
turn rate option).
Autotrim
Controls how fast 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. Lower autotrim will give faster
elimination of a constant heading offset
Ú
Note: In VRF mode this parameter controls the time constant of
the rudder estimate. A lower value makes the rudder estimate
faster, i.e. that it will more quickly catch up with the boat's
movements.
Init rudder
Defines how the system moves the rudder when switching from
power steering to an automatic mode.
The following options are available:
• Center
Moves the rudder to zero position
4
User settings | NAC-2/NAC-3 Commissioning Manual
23
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