Calibration option, AP44
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Note: The setup of the compass should be done in calm sea
conditions and with minimal wind and current to obtain good
results. Ensure that there is enough open water around the
vessel to make a full turn.
Refer to your heading sensor's documentation for further details for
your unit.
Transition speed
The transition speed is the speed at which the system automatically
changes between Low speed and High speed steering profiles.
The steering profiles are used to accommodate the boats' tendency
to exhibit different steering characteristics at different speeds. You
may also have different preferences about the steering performance
of your boat required at low and high speeds.
On power boats it is recommended that you set a value that
represents the speed where the boat's steering characteristics
change. For instance the planing threshold (recommended), or at
the speed you want the autopilot to change behavior.
There is a 2 knots hysteresis to prevent oscillation of high/low
settings when the vessel is travelling at or near the transition speed.
Example
The transition speed is set to 9 knots.
• The system changes from Low profile to High profile when the
speed increases to 10 knots (= Transition speed plus 1 knot)
• The system changes from High profile to Low profile when the
speed decreases to 8 knots (= Transition speed minus 1 knot)
Sea trial | NAC-2/NAC-3 Commissioning Manual
17
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