Tacking in WIND mode
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Note: The tack function is only available when the system is set up for boat type SAIL in
the Autopilot Commissioning dialog and is not available for NAC-1 autopilot computers
Tacking should only be performed into the wind and must be tried out in calm sea
conditions with light wind to find out how it works on your boat. Due to a wide range of
boat characteristics (from cruising to racing boats) the performance of the tack function may
vary from boat to boat.
Tacking in WIND mode as compared to AUTO mode is 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. The tack time is also controlled by the speed of the boat to prevent loss of
speed during a tack.
You can initiate the tack function from WIND mode.
When you initiate the tacking, the autopilot immediately mirrors the set wind angle to the
opposite side of the bow.
You can interrupt the tack operation as long as the tack dialog is open by selecting the
opposite tacking direction. When interrupted, the boat returns to the previous set heading.
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.
Turn pattern steering
The autopilot includes a number of automatic turn steering features when the autopilot is in
AUTO mode.
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Note: The turn steering option is not available if the boat type is set to SAIL in the
Autopilot Commissioning dialog, instead the tack/gybe feature is implemented.
Initiating a turn
You start the turn by selecting the relevant turn icon, followed by selecting the port or
starboard options in the turn dialog to select the turn direction.
Stopping the turn
You can stop the turn from within the turn dialog.
At any time during a turn you can select Autopilot standby in the System Controls dialog
to return to Standby mode and manual steering.
You can also stop a turn by pressing a physical standby key to return to Standby mode and
manual steering.
Turn variables
The turn steering options, except the C-turn, have settings that you can adjust before you
start a turn and at any time when the boat is in a turn.
U-turn
U-Turn changes the current set heading to be 180° in the opposite direction.
The turn rate is identical to Rate limit settings. This cannot be changed during the turn.
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Note: Refer to the separate NSS evo3 Installation manual for information about Rate limit
settings.
C-turn
Steers the vessel in a circle.
You can adjust the Rate of turn from the turn dialog before the turn is initiated and during
the turn. Increasing the turn rate makes the vessel turn a smaller circle.
Autopilot | NSS evo3 Operator Manual
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