Wind function
With wind function set to Auto, the autopilot automatically selects
between apparent and true wind steering. Auto is default and
recommended for cruising.
When the boat is running or on a broad reach, there is a greater
chance it will surf on the waves. This may lead to significant
changes in boat speed, and thereby changes in apparent wind
angle. True wind steering is therefore used to prevent undesired
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
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 (HI/LO)" on page 30.
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.
Software Setup | GO7 Installation Manual
33
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