NT888G MK2 AUTOPILOT OPERATING MANUAL
1.7
Altering to a New Heading (Section 2.36) … (Continued).
To alter course to a new heading using the Autopilot: -
(i)
Use the “
LIMITS
” key to enter the Limits Menu where the Rudder Limit
value is the first item shown and should now be highlighted by a blue
band.
NB
. Each parameter in the Limits Menu is selectable via step by step
use of the LIMITS keypad and is confirmed by the blue band moving to
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).
1.9
Programmable Automatic Rate of Turn (ROT) 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 higlighted.
