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

 

 

 

 

 

 

Boat's Speed

 

 

 

 

 

 

slow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

calm

 

 

 

 

 

Sea State

 

 

 

 

 

 

rough

 

 

 

 

 

 

 

 

 

 

 

 

 

light

 

 

 

 

 

Load Condition

 

 

 

 

heavy

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

low

 

 

 

 

 

RUDDER GAIN

 

 

 

high

 

 

 

 

 

 

 

 

 

 

General guidelines for setting rudder gain

 

 

 

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-511/520/611 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.

 

Large course error

Counter rudder:

Intended

small setting

course

Counter rudder: proper setting

The counter rudder feature functions to smoothly return ship's heading toward intended course.

slow

 

 

 

 

 

Boat's Speed

 

 

 

 

fast

 

 

 

 

 

 

 

 

 

 

 

 

light

 

 

 

 

 

Load Condition

 

 

 

 

heavy

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

low

 

 

 

 

COUNTER RUDDER

 

 

high

 

 

 

 

 

 

 

 

General guidelines for setting counter rudder gain

4-6

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Image 44
Furuno 611, 511, 520 manual Counter Rudder, General guidelines for setting counter rudder gain

611, 520, 511 specifications

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