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4. MENU OPERATION
Set rudder gain so that the boat does not make frequent yaw. The figure shown below
provides general guidelines for setting rudder gain.
fast
calm
light
low
COUNTER RUDDER
If the boat is heavily loaded, the heading could change excessively because of inertia. This
phenomenon causes the vessel to "overshoot" the intended course. If this happens, the
NAVpilot-500 will steer the rudder to the opposite side and the heading will turn in opposite
direction excessively again. In an extreme case the heading oscillates several times until it
finally settles in the new course. An adjustment known as "counter rudder" prevents this
kind of oscillation.
Counter rudder is usually not required for small boats. When your boat zigzags a lot before
settling in the new course, increase the counter rudder setting.
Counter rudder:
small setting
Counter rudder:
proper setting
4-6
Boat's Speed
Load Condition
RUDDER GAIN
General guidelines for setting rudder gain
The counter rudder feature functions to smoothly
return ship's heading toward intended course.
Boat's Speed
slow
Load Condition
light
COUNTER RUDDER
low
General guidelines for setting counter rudder gain
Sea State
Large course error
slow
rough
heavy
high
Intended
course
fast
heavy
high
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