Simrad NSS12, Technical Manual

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Autopilot | NSS Installation Manual
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
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.
You can manually adjust all parameters that are set during autotuning.
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
Setting sailing parameters
¼
Note:
Sailing parameter settings are only available if the
boat type is set to Sail.
Tack time
When performing a tack in WIND mode, the rate of turn
(tack time) can be adjusted. This will give single-handed
sailors time to handle the boat and the sails during a
tack.
A turn performed without shifting wind side, will also
be made at a controlled turn rate.
Range Change per step Default Units
2 - 50 1 12 seconds
Tack angle
This value is used to preset the course change used when tacking in AUTO mode. By pressing
the left/right arrow keys the course will change as much as this value.
Range Change per step Default Units
50 - 150 1 100 °
Wind function
With wind function set to Auto, the autopilot will automatically select between apparent and
true wind steering. Auto is default and recommended for cruising.
When the boat is running or on a broad reach, there is a heightened chance it will surf on the
waves. This may lead to significant changes in boat speed, and thereby changes in apparent
wind angle. True wind steering is therefore used to prevent undesired corrections by the au-
topilot when heading downwind (or close to), while steering to apparent wind is used when
beating or reaching.
Apparent wind steering is preferred when you want to maintain maximum boat speed
without continuous trimming of the sails.
VMG optimizing
You can optimize the VMG to wind. When selected the function will be active for 5–10
minutes after a new wind angle has been set and only when beating.