Simrad GO XSE Installation Manual page 49

corrections by the autopilot when heading downwind (or close to),
while steering to apparent wind is used when beating or reaching.
Apparent wind steering is preferred when you want to maintain
maximum boat speed without continuous trimming of the sails.
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 keeps the boat on the track line. If the XTE from
the navigator exceeds 0.15 nm, the autopilot calculates the layline
and track towards the waypoint.
Manually adjusting steering parameters
Ú Note:
These settings are not available for NAC-1 autopilot
computers.
The autotune function in the autopilot is so refined that the majority
of boats need no further adjustments of the steering parameters.
On some boats however, or in particular sea conditions, fine tuning
of the steering parameters may improve the performance of the
autopilot.
Transition speed
Refer to "Setting the Transition speed" on page 46.
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. If the value is set too high the overshoot will increase
and the steering will be unstable.
Counter rudder
Counter rudder is the amount of counteracting (opposite) rudder
applied to stop the turn at the end of a major course change. The
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Software Setup | GO XSE Installation Manual