Fig. 3-5 Ap9 Mk3 Course Handling - Simrad Robertson AP9 Mk3 Instruction Manual

2. By the PORT and STBD one-degree-course change-buttons, also
3. By navigation receiver in CTS or Mixed Nav. steering modes.
During operation of the autopilot, only one compass (main compass
or steering compass) will provide ship's heading reference for auto
steering. The other compass (monitor compass) is only used to
compare the main compass heading and eventually trigger a
COMPASS DIFFERENCE alarm. The setting of the limit is made by
altering the OFF-COURSE LIMIT value.
COURSE SELECTOR
P S
NAV.
XTE
NAV. REG.
REC.
NAV.
CTS
REC.
COURSE TO STEER
This means that even with one compass connected, the OFF-COURSE
warning will still be active, but NO COMPASS DIFFERENCE will
occur.
The COURSE ERROR signal for the PID regulator is determined by
the steering compass heading and the course selector/one-degree
buttons.
When switching for NAV mode, the course selector and one-degree
buttons are disconnected. The heading will then be determined by
the NAV OFFSET signal from the XTE navigational receiver or from
the CTS SAT.NAV receiver.
Selection is made by the INFO LOOP 2, Nav. Steering Type
XTE/CTS/ PRIORITY.
20169223D
when operating in the AUTOPILOT mode
STEERING COMPASS
COURSE
SELECT
NAV. OFFSET
COURSE
TO STEER
MONITOR
COMPASS
AP9 MK3 Course Handling
Design and theory of operation
SHIP'S
COURSE
COMP. SELECT
AUTO
HEADING REF.
NAV
NAV. COURSE
COMP. SELECT
AUX. COURSE
Fig. 3-5
MAN
DISPLAY
COURSE
AUTO
NAV
TO PID
REGULATOR
COURSE
ERROR
OFF COURSE
ALARM
COMPASS
DIFFERENCE
3-5