it will take a long time to compensate for a heading error, and the autopilot will fail to
keep a steady course. If the value is set too high the overshoot will increase and the
steering will be unstable.
• Counter rudder: Relation between change in heading error and applied rudder. Higher
counter rudder will reduce applied rudder faster when approaching the set heading
• Auto trim: Controls how aggressively the autopilot will apply rudder to compensate for a
constant heading offset, e.g. when external forces such as wind or current affects the
heading. Lower auto trim will give faster elimination of a constant heading offset
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Note: In VRF mode this parameter controls the time constant of the rudder estimate. A
lower value makes the rudder estimate faster, i.e. that it will more quickly catch up with
the boat's movements.
• Init rudder: Defines how the system moves the rudder when switching from manual
steering to an automatic mode.
-
Center: Moves the rudder to zero position
- Actual: Maintains the rudder offset
• Rudder limit: Determines the maximum rudder movement in degrees from midship
position that the autopilot can command the rudder in the automatic modes. The Rudder
limit setting is only active during autosteering on straight courses, NOT during course
changes. Rudder limit does not affect Non-Follow-up steering
• Off heading limit: Sets the limit for the off heading alarm. An alarm occurs when the actual
heading deviates from the set heading more than the selected limit
• Track response: Defines how fast the autopilot shall respond after having registered a
cross track distance
• Track approach angle: Defines the angle used when the vessel is approaching a leg. This
setting is used both when you start navigating and when you use track offset
• Course change confirm angle: Defines the limits for course change to next waypoint in a
route. If the course change is more than this set limit, you are prompted to verify that the
upcoming course change is acceptable.
Sailing
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Note: Sailing parameters are
only available when the boat type is set to Sail.
This option allows for manually changing parameters that were set during the
commissioning of the autopilot computer. For more details of the settings, refer to the
separate documentation for the autopilot computer.
• Tack time: Controls the rate of turn (tack time) when performing a tack in wind mode.
• Tack angle: Controls the angle that the boat will tack to between 50º - 150º in Heading
hold mode
• Wind function: Select what wind function the autopilot will use when in wind mode
-
Auto:
If TWA is <70º: Wind mode will use AWA
If TWA is ≥70º: Wind mode will use TWA
- Apparent
- True
Autopilot | NSO evo3 Operator Manual
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