Chapter 2: Autopilot Operation 8-2-19
ST290 Instrument System Owner’s Handbook
As changes in the wind angle occur, the autopilot adjusts the locked
compass heading to maintain the set angle to the wind.
True and apparent wind
In WIND VANE mode, T150, 150G, T400 and 400G autopilots can
maintain a course relative to either:
• apparent wind, the autopilot maintains the apparent wind angle,
or
• true wind, the autopilot maintains the true wind angle.
You can adjust the factory default setting of apparent wind, in Pilot Basic
or Advanced Calibration (see Section 8, Chapter 5).
WindTrim
In Wind Vane mode the autopilot uses WindTrim to eliminate the effects
of turbulence and short term wind variations. This provides smooth and
precise performance with minimal
power consumption. You can
adjust the WINDTRIM RESPONSE
level in Pilot Basic or Advanced
Calibration (see Section 8,
Chapter 5) to control how quickly
the autopilot responds to changes
in the wind direction. Higher wind
trim settings will result in a pilot
that is more responsive to wind
changes.
Selecting Wind Vane mode
To select Wind Vane mode from
either Standby or Auto mode:
1. Steady the boat onto the
required wind angle.
2. Press
STANDBY and AUTO simultaneously to select Wind Vane mode.
and lock the current wind angle. The display shows the locked head-
ing, wind type and the wind angle.
H
e
a
d
i
n
g
Wind angle
D6056-1
WIND
81183_2 S8.book Page 19 Tuesday, May 6, 2003 9:08 AM
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