When the vessel reaches the arrival circle for a routepoint, the autopilot gives an audible
warning and displays a dialog with the new course information. If the required course
change to the next waypoint is less than the Navigation change limit, the autopilot
automatically changes the course. If the required course change to next waypoint in a route
is more than the set limit, you are prompted to verify that the upcoming course change is
acceptable.
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Note: For information about navigation settings, refer to "Navigation settings" on page 49.
Waypoint arrival circle
The Arrival radius defines the point at which a turn is initiated when you are navigating a
route.
The arrival circle (1) should be adjusted according to boat speed. The higher the speed, the
wider the circle. The intention is to make the autopilot start the heading change in due time
to make a smooth turn onto the next leg.
The figure below may be used to select the appropriate waypoint circle when creating the
route.
X axis = Boat speed in knots
Y axis = Arrival circle, radius in 1/100 Nm
Example: With the speed of 20 knots you should use a waypoint circle with radius 0.09 Nm.
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Note: The distance between any waypoints in a route must not be smaller than the
radius of the waypoint arrival circle.
WIND mode
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Note: WIND mode is only available if the system has been set up for boat type SAIL in
the Autopilot Commissioning dialog. This mode is not available for NAC-1 and AC70
autopilot computers. It is not possible to active WIND mode if wind information is
missing.
When wind mode is engaged, the autopilot captures the current wind angle as steering
reference, and adjusts the heading of the boat to maintain this wind angle.
Switch to WIND mode by selecting it in the Autopilot controller.
Autopilot | NSO evo3 Operator Manual
59
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