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4. HOW TO CUSTOMIZE YOUR NAVPILOT
4-4
The following illustrations show how many degrees the NAVpilot steers the rudder in
order to nullify 4 degrees of course deviation with various settings of the rudder gain.
Set rudder gain so that the boat does not make frequent yaw. The figure shown below
provides general guidelines for setting rudder gain.
[COUNTER RUDDER]: If the boat is heavily loaded, the heading could change exces-
sively because of inertia. This phenomenon causes the vessel to "overshoot" the in-
tended course. If this happens, the NAVpilot 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 adjust-
ment 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.
Rudder gain = 1° Rudder gain = 2° Rudder gain = 3°
Rudder angle = 4° x 1=4° Rudder angle = 4° x 2=8° Rudder angle = 4° x 3=12°
4°
4°
4°
Speed
Sea State
Load Condition
RUDDER GAIN
Fast
Calm
Light
Low
Slow
Rough
Heavy
High