Wind Steering And Navigation; Control Of Steering Performance - Simrad NSO Operation Manual

Wind steering and navigation

In Wind Nav the autopilot steers the boat given both wind data and track data from a
GPS/chart plotter.
In Wind Nav mode the autopilot calculate the initial course change needed to navigate
towards the active waypoint, but the pilot will also utilize the current wind direction in
the calculation.

Control of steering performance

When operating in an automatic mode the pilot utilizes
two different sets of steering parameters (HI/LO). The
parameters control the response of the boat at different
speeds or wind directions. The two parameter sets can be
automatically or manually selected, and each set can be
manually adjusted.
The speed at which the autopilot automatically changes
from LO to HI parameters is determined by the transition
speed setting.
At no speed input the autopilot defaults to LO steering
parameters when engaging an automatic mode from STBY.
This is a safety feature to prevent oversteering.
Active response parameter set is shown in the autopilot
popup, and the following abbreviations are used:
Power boats
On power boats the automatic selection of HI or LO is determined solely by the speed of
the boat as shown in the graphics below.
74 | Autopilot operation
HI-A High response parameters set automatically
LO-A Low response parameters set automatically
HI-M High response parameters set manually
LO-M Low response parameter set manually
Transition speed set to 9 kn
Transition to HI parameters
with decreasing speed: 8 kn
Transition to LO parameters
with increasing speed: 10 kn