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2.5
Course selection
The course selector section on the autopilot consists of a bargraph
display, a digital heading display, a course selector and two course
adjustment buttons, PORT and STBD.
The bargraph display operates in two modes, AUTOPILOT and
NAVIGATION-mode, displaying in degrees the difference between
actual vessel heading and course to steer. On the display each "bar" is
equal to one degree, and the range is 20 degrees to port and
starboard. An arrow on each side indicates starboard and port rudder
commands.
No arrows for analogue signal output.
Note !
In HELMSMAN mode the digital heading display gives a read-out of
actual ships heading, while in AUTOPILOT and NAVIGATION
modes the read-out is course to steer.
The Course Selector is used for major course changes in AUTOPILOT
mode. To activate the knob it must be pressed down and released. If
the knob is not turned within 10 seconds, it has to be pressed again.
Clockwise turns gives a starboard course change and vice versa. One
revolution on the course selector knob is equal to a 60 degree course
change.
The PORT and STBD push buttons are for minor course adjustments,
pressed once gives a one degree course change in the appropriate
direction.
These two buttons and the course selector are only active in
AUTOPILOT mode.
When making course changes by the push buttons the TURNRATE
Note !
function is not activated.
2.6
Navigational steering
General
Navigational steering should be used in open waters only.
Navigational steering is based upon signals taken from Loran C and
GPS Nav. receivers. The signals are called Cross Track Error (XTE)
and Bearing waypoint-waypoint (BWW), termed course to steer
(CTS).
When cross track steering is used, the information display gives a
read-out of actual cross track error in thousandths of a nautical mile
(.001). The XTE signal changes the set course to keep the vessel on
track.
AP9 MK3 can operate in a (CTS) mode where the bearing to the
waypoint is defined to be the course to steer by the autopilot. The
information display gives bearing to waypoint, elapsed time since
20169223D
Operation
2-15
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