Raymarine SmartPilot X-5R, Drive Installation & Setup

Page: 53 / 76

Chapter 3: Commissioning & Setup 45
Rudder gain
Boats can vary widely in their response to helm, and by adjusting the rudder gain you
can change the SPX-5R Drive system’s steering characteristics. Rudder gain is a
measure of how much helm the SPX-5R Drive system applies to correct course errors
– higher settings mean more rudder is applied.
Checking
Complete the following test to determine whether the rudder gain is set correctly:
1. Ensure you have set the SPX-5R Drive response to level
5 , as described above.
2. Motor your boat at a typical cruising speed in clear water.
It is easier to recognize the steering response in calm sea conditions where wave
action does not mask steering performance.
3. Press
auto
to enter Auto mode, then alter course by 40°:
• if the rudder gain is adjusted correctly, the 40° course change should result in
a crisp turn followed by an overshoot of no more than 5°.
• if the rudder gain setting is too high, the 40° course change will result in a dis-
tinct overshoot of more than 5° and there may be a distinct ‘S’ in the course
(A)
Correct this oversteer by reducing the rudder gain setting.
• if the rudder gain is too low, the boat’s performance will be sluggish – it will take
a long time to make the 40° turn and there will be no overshoot
(B).
Correct this understeer by increasing the rudder gain setting.
Adjusting
To adjust the rudder gain:
1. Enter Dealer calibration as described on
page 35 .
2. Use
disp
as necessary to access the RUDD GAIN screen.
3. Use
-1
or +1 to adjust the rudder gain.
4. Hold down
standby
for 2 seconds to save the changes and leave Dealer calibra-
tion.
5. Press
auto
to check the SPX-5R Drive system performance in Auto mode.
New
heading
New
heading
A
New
heading
B
Correct
rudder gain
Rudder gain
too high
Rudder gain
too low
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