Furuno NAVpilot-700 Installation Manual page 64

3. INITIAL SETTINGS
The illustration shown right shows boat's track
lines with weather setting 3° and 7°. When 7° is
set, for example, the rudder is not driven until the
course deviation exceeds 7°. Increasing the set-
ting reduces activation of the steering gear, how-
ever the boat tends to zigzag. When the sea is
calm, set a smaller value.
[RUDDER GAIN]: When the boat's heading deviates from the set course, the NAVpilot ad-
justs the rudder to correct it. The rudder angle (number of degrees) which is steered
against every degree of course deviation is known as the rudder gain.
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.
Rudder gain =
4°
Rudder angle = 4°
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
3-28
1° Rudder gain =
x 1=4° Rudder angle =
Load Condition
RUDDER GAIN
7°
3°
2°
4°
4° x 2=8°
Speed
Sea State
Weather = 3° Weather =
Rudder gain = 3°
4°
Rudder angle = 4° x 3=12°
Slow
Rough
Heavy
High
7°