Raymarine autopilot + ST4000+ - Manual (Page 25)

10 ST4000+ Wheel & Tiller Autopilots: Owner’s Handbook
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Automatic tack (AutoTack)
The ST4000+ has a built in automatic tack facility (AutoTack) that
turns the boat through a pre-determined angle in the required
direction. The default AutoTack angle is 100°, but you can adjust this
in Dealer setup (see page 109).
• to AutoTack to port: press the -1 and -10 keys together
• to AutoTack to starboard: press the +1 and +10 keys together
Making major course changes
CAUTION:
Only make major course changes when steering MANUALLY.
This ensures that the boat will safely clear any obstructions or
other boats, and you can take into account the changed wind and
sea conditions on the new heading before engaging the autopilot.
Large course changes which change the apparent wind direction can
produce large trim changes. When a sudden trim change occurs (for
example due to weather helm or sail imbalance) there will be a delay
of up to one minute before the automatic trim applies rudder to restore
the locked heading.
In these situations, the autopilot will not immediately assume the new
automatic heading, and will only settle onto course when the
automatic trim has been fully established. To eliminate this problem,
use the following procedure to make major course changes:
Wind
AutoTack - Starboard
D5399-1
Wind
AutoTack - Port
AutoTack
angle
AutoTack
angle