Raymarine St290 - Page 289

Chapter 4: Commissioning the Autopilot 8-4-19
ST290 Instrument System Owner’s Handbook
Adjusting the counter rudder
If you intend to use RESPONSE level 3 on a T150 or T400 (non-GyroPlus)
autopilot system, you will need to adjust the COUNTER RUDDER. Counter
rudder is the amount of rudder the autopilot applies to control the yaw of
the boat. Higher counter rudder settings result in more rudder being
applied. The adjustment range is from 1 to 9.
To check the counter rudder setting:
1. Set RESPONSE to level 3.Todothis:
i. At the Pilot Keypad, press the
RESP button.
ii. Use the
-1 or +1 button to adjust the setting.
iii. Press the Pilot Keypad
DISP button or wait for 10 seconds.
2. Sail your boat at cruising speed in clear water.
3. At thePilot Keypad,press
AUTO to switch the autopilotto Auto mode,
then use the
-10 and +10 buttons to make a 90° course change:
• When gain and counter rudder are both set correctly, the boat per-
forms a smooth continuous turn with minimal overshoot.
• If the counter rudder is too low, the boat will still overshoot.
• If counter rudder is too high, the boat will ‘fight’ the turn and
make a series of short, sharp turns: this results in a very ‘mechan-
ical’ feel as the boat changes course.
To adjust the counter rudder:
4. Press
AUTO to check the autopilot performance in Auto mode.
This completes the commissioning for T150 and T400 autopilot
systems, although over time it may be necessary to repeat the
adjustments for T150 or T400 (non-GyroPlus) autopilot systems, for a
range of sea conditions and headings, to maintain good overall
performance (see Further adjustments below).
1. Access Pilot Advanced Calibration
andusethe buttontoscrolltothe
COUNTER RUDDER screen.
2. Use the or button to adjust the
rudder level. The adjustment can be
madefrom1to9.
3. To save the setting change, press the
button.
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