Raymarine autopilot control unit - Manual (Page 64)

Chapter 4: Customising the System 47
Proportional applies rudder in proportion to Joystick movement - the
further the Joystick is held over the greater the applied rudder.
Bang-Bang applies continuous rudder drive in the direction of lever
movement. To improve control the speed of rudder movement
changes with the angle of the lever. For maximum speed push the lever
hard over. If the lever is returned to the centre position the rudder will
remain in its current position.
Range: OFF
1 = Proportional
2 = Bang-bang
Default: OFF
Drive Type
The drive type controls the way which the autopilot drives the steering
system. The default setting should be retained for mechanically driven
vessels.
Range: 1 = Mechanically driven vessels without a rudder reference unit
2 = Hydraulic, no rudder reference unit
3 = Linear, rotary and sterndrive with a rudder reference unit
4 = Hydraulic with rudder reference unit
Default: for Pilot Type Displacement 3
for Pilot Type Semi-Displacement 4
for Pilot Type Planing 4
for Pilot Type Sterndrive 3
Rudder Damping
Set this option only if your system includes a rudder reference unit, and
the drive hunts when trying to position the rudder.
Test for this when your vessel is moored dockside, by pressing AUTO
and then +10. If the helm overshoots and has to drive back, or starts to
hunt back and forth, increase the damping level.
Alternatively, you can set a value between 1 to 9. Adjust the damping
one level at a time, and always use the lowest acceptable value.
Range: 1 to 9
Default: 2
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