Simrad NSS evo2 series Installation Manual page 34

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¼ Note:
Make sure that both the compass heading and the bearing to the object have the same
unit (°M or °T).
Setting the Transition speed (HI/LO)
This is the speed at which the system automatically changes from LO to HI steering
parameters.
On power boats it is recommended that you set a value that represents the speed where the
hull begins to plane or the speed where you change from slow to cruising speed.
On sailboats the transition speed should be set to around 3-4 knots to give the best response
in a tack.
A deadband of 2 knots is incorporated to prevent oscillation of HI/LO settings when vessel is
travelling at the transition speed.
1
3
1 HI response
2 LO response
3 Transition to HI parameters with decreasing speed: 8kn
4 Transition speed set to 9kn
5 Transition to LO parameters with increasing speed: 10kn
Active response parameter set is shown in the autopilot popup, and the following
abbreviations are used:
Autotuning
The autotune feature will run the boat through several tests and then automatically set the
most important steering parameters. Autotune is not required for the autopilot to function, as
it is preset with steering parameters that should steer most boats in the 30-50 foot range. All
parameters that are set during autotuning can be manually adjusted.
Seastate filter
The Seastate filter is used to reduce rudder activity and autopilot sensitivity in rough weather.
OFF Seastate filter is disabled. This is default
AUTO Reduces rudder activity and autopilot sensitivity in rough weather by an
adaptive process. The AUTO setting is recommended if you want to use the
seastate filter
MANUAL Linked to the steering response control settings described previously. It may be
used to manually find the optimum combination of course keeping and low
rudder activity in rough but steady sea conditions
Software setup | NSS evo2 Installation Manual
2
4 5
HI-A High response parameters set automatically
LO-A Low response parameters set automatically
HI-M High response parameters set manually
LO-M Low response parameter set manually