Simrad NSO, Руководство по эксплуатации

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Autopilot operation | 73
Tacking in Auto mode
Tacking in AUTO mode is different
from tacking in WIND mode. In
AUTO mode the tack angle is fixed
and as defined by the user. Refer
to the sailing setup description in
the separate Autopilot Installation
section.
When tacking direction is selected
the autopilot changes the current
set course according to the set fixed
tacking angle.
Tacking in Wind mode
Tacking in WIND mode as compared to AUTO mode can be performed when sailing with
apparent or true wind as the reference. The true wind angle should be less than 90
degrees.
The rate of turn during the tack will be given by the Tack time defined in the sailing
parameter setup (refer illustration above). The tack time is also controlled by the speed
of the boat to prevent loss of speed during a tack.
When you initiate the tacking, the autopilot will immediately mirror the set wind angle to
the opposite side of the bow.
Gybing
Gybing is possible when the true wind angle is larger than 120°.
The time to make a gybe is determined by the speed of the boat to make it as quick as
possible within control.
Tack and gybe prevent
You should use the autopilot with care when beating and running.
If the sails are unbalanced when beating, yaw forces from the sails can drive the boat
into the wind. If the boat is driven beyond the set minimum wind angle, the thrust from
the sails will suddenly disappear and reduces the boat speed. The boat will then be more
difficult to steer as the rudder will become less effective.
The tack prevent function in WIND mode has been implemented to avoid such situations.
It will react immediately when the apparent wind angle becomes 5° less than the set
minimum wind angle, and more rudder will be commanded.
When running, it is difficult to steer the boat with waves coming sideways or from
behind. The waves may yaw the boat into an unwanted gybe; this can be hazardous for
both the crew and the mast.
The gybe prevent function will be activated when the actual apparent wind angle
becomes greater than 175° or gets opposite to the set wind angle. More rudder will be
commanded to prevent an unwanted gybe.
The tack and gybe prevent functions are not a guarantee against getting into a
hazardous situation. If the effect of the rudder and/or drive unit is not adequate, a
dangerous situation may occur. Pay particular attention in such situations.