Simrad NSS12 Installation Manual page 48

48 |
Autopilot | NSS Installation Manual
Setting sailing parameters
 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
2 - 50
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
50 - 150
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, it will also be surfi ng on the waves. This may lead to signifi cant
changes in boat speed, and thereby also changes in apparent wind angle. True wind steering
is therefore used when running, while steering to apparent wind is used when beating or
reaching.
Apparent wind steering is preferred when you want to achieve maximum boat speed. The
autopilot tries to maintain a constant apparent wind angle to get maximum thrust from a
given trim of the sails.
When sailing in closed waters, the apparent wind angle may change temporarily due to wind
gusts. It may then be preferred to sail to the true wind.
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.
Layline steering
Layline steering is useful when navigating. Cross Track Error (XTE) from the navigator will keep
the boat on the track line. If the XTE from the navigator exceeds 0.15 nm, the autopilot will
calculate the layline and track towards the waypoint.
Manually adjusting steering parameters
The autotune function in the autopilot is so refi ned that the majority of boats will need no
further adjustments of the steering parameters. On some boats however, or in particular
sea conditions, fi ne tuning of the steering parameters may improve the performance of the
autopilot.
Transition speed
Refer previous description.
Rudder
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.
Change per step
1
Change per step Default
1 100
Default Units
12 seconds
Units
°