Operating manual ALPHASEAPILOT MFC Issue 1.1 Page 11 of 84
ALPHASEAPILOT MFC
1.7 Altering to a New Heading (
Section 2.36
)
In full Adaptive operational mode, a course change executed by the Autopilot system may be
controlled by pre-programmed Rate or Radius of Turn data.
These limiting factors can also apply in the non Adaptive (PID) operating mode provided the
Autopilot CONTROLS and LIMITS menus have been programmed and - for Radius controlled
turns - that Speed (SOG) input data is available.
If the existence of safe limiting factors is uncertain, the RUDDER LIMIT function – which
otherwise limits the maximum permissible angle of rudder applied by the Autopilot – can be
employed to produce small rudder angles/slow turns.
To alter course to a new heading using the Autopilot: -
(i) Use the “LIMITS” to enter the Limits Menu where the Rudder Limit value is the
first item shown and should now be flashing.
NB. Each parameter in the Limits Menu is selectable via step by step use of the
LIMITS keypad and is confirmed by flashing of the appropriate box.
(ii) Set the Rudder Limit value (RUD LT) to a safe value (range 5° to 50°) via the
rotary (+/-) illumination control.
(iii) Turn the Course Selector (“Set Course” Control) clockwise to alter course to
Starboard or anticlockwise to alter course to Port. The Port & Starboard demand
chevrons will flash & an audible bleep will be heard.
(iv) Press the “CONFIRM” key to execute the turn. As a safety precaution to prevent
accidental course selector operation the course change will be cancelled if the
confirm key is not pressed within the timeout period (nominally 30 sec). Without
confirmation within 30 seconds the new course demand will automatically cancel
and the original set course will be maintained. Pressing the “CANCEL” key will
also cancel the course change.
NB. The Autopilot will order the vessel to turn in the same direction as the Course
Selector knob is turned for any amount of Course change up to 359°. The result is that
if the course change is more than 180° the vessel will continue to take the “long way”
round to the new course.
1.8 Adjusting Rate of Turn using the Rudder Limit Control (
Section 2.31
)
To adjust (simple) Rate of Turn when altering course using the Autopilot: -
If vessel turns too quickly - reduce Rudd Limit (RUD LT) value 1 - 9 per 1.7 (ii).
If vessel turns too slowly - increase Rudd Limit (RUT LT) value 1 - 9 per 1.7 (ii).
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