Simrad Robertson AP9 Mk3, Instruction Manual, Page: 34 / 202

Robertson AP9 MK3 Autopilot
2-6
20169223D
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To adjust the illumination, first press the DIMMER button, than
the INCREASE or DECREASE button. In the information display a
number and a bargraph represent the brightness level.
COMPASS SELECT
The autopilot is capable of reading two heading sensors
simultaneously: Main (steering) compass and monitor (comp.
difference) compass.
If only one compass is connected, this will always be the main
compass. The autopilot shows the main compass heading in
HELMSMAN-mode and selects this heading as set course in
AUTOPILOT mode. The difference between the set course on the
autopilot and the main compass heading is known as the off course
deviation.
The autopilot monitors the off course deviation and if it exceeds the
selected off course limit, an off course alarm will sound. (See page 5-
36 for selection of off course limit).
If more than one compass is connected, one is selected as main
compass and one as monitor compass. The autopilot now monitors
the heading difference between the main compass and the monitor
compass. The heading difference alarm is given when the difference
exceeds the off course limit and thus the heading difference alarm
also acts as an additional off-course alarm.
Press the COMPASS SELECT button once and the information
display shows the selected main compass. By then pressing the
INCREASE or DECREASE button another compass can be selected as
main compass from one of the compasses connected to the autopilot.
Press the COMPASS SELECT button a second time and the
information display shows the selected monitor compass. Another
monitor compass can be selected (not the one selected as main
compass) by using the INCREASE or DECREASE buttons. The
monitor compass can also be switched off by the same buttons.
RUDDER
When the RUDDER button is pressed, the Information Display
shows selected RUDDER value. The RUDDER value sets the ratio
between rudder angle and heading error (p-factor).
Example: If RUDDER is set to 1.0 and there is a heading error of 2
degrees, the rudder angle will be 2 degrees. (Heading error x
RUDDER value = rudder angle).
The correct RUDDER setting is dependent upon the size and speed of
the vessel. The RUDDER value should increase with decreasing
speed.