Operating manual ALPHASEAPILOT MFC Issue 1.1 Page 12 of 84
ALPHASEAPILOT MFC
1.9 Programmable Automatic Rate of Turn Control (
Section 2.6, 2.32 &
2.33
)
The Autopilot Rate of Turn (ROT) control function can operate – as programmed via the
CONTROLS and LIMITS Menus – in both the Adaptive and non Adaptive (PID) modes:-
To select Rate of Turn control vs Radius of Turn:-
(i) Use the “CONTROLS” key to select the Controls Menu.
(ii) Use the “CONTROLS” key again to step through the Menu listing until the “TURN
TYPE” box is flashing.
(iii) Use the rotary (+/-) illumination control to select “ROT”.
To select required Rate of Turn (6 – 300 deg/min or 0.1 – 5 deg/sec):-
NB. ROT can be expressed (and displayed) in °/min or °/sec as preferred and can be selected
accordingly via the Set Up Menu. (Section 2.6(v) refers).
(iv) Use the “LIMITS” key to display the Limits Menu.
(v) Use the “LIMITS” key again to step through the Menu listing until the “ROT°/S”
box is flashing.
(vi) Use the rotary (+/-) illumination control to select the required ROT in °/min or
°/sec (noting that 6–300°/min = 0.1-5°/sec).
Using the Turn Rate control.
Provided the Rate of Turn function is enabled and specified with a value in °/min or °/sec, it will
automatically control the vessel’s rate of turn during course changes. When the vessels Rate of
Turn is being limited by this function the SET ROT display box will flash alternating between the
value set (i.e. 1°/SEC) and “MAX”. As the vessel approaches the new set heading and the
Rate of Turn decreases, the MAX display indication will automatically extinguish.
NB. During Track Steering Mode using the HTC sentence (Section 2.9 & 2.38) it is possible for
the Track Controller to override the Autopilot programmed (internal) value. However, this is
only possible up to any maximum permissible ROT value set within the Autopilot. In this (HTC
sentence) Track Steering Mode, it is not possible to manually Adjust ROT.
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