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Robertson AP9 Mk3 Autopilot
This adjustment is for XTE navigation only, and not used in CTS
mode (e.g. satellite receivers).
The NAV. TRIM parameter compensates for a constant offset from
the track line, caused by wind and current conditions.
This function gives a course to steer offset based upon the average
track offset.
A low NAV. TRIM value will result in a quick build-up of the offset,
and a high value will result in a slow build-up of the offset.
The NAV. TRIM is reset every time the NAV. SYSTEM button is
pressed.
Range:
Gyro adjust
This parameter will only appear in the display in HELMSMAN mode if the
Note !
selected steering compass is of a geared synchro or stepper output type.
Align the autopilot read-out to correspond with the gyro heading.
Check the alignment every time the autopilot/gyro is switched on.
The autopilot reading is aligned by using the INCREASE or
DECREASE buttons.
On the same condition the autopilot will, at switch on, show GYRO
ADJUST, and the same procedure will apply before the autopilot can
be brought into service.
Compass difference
This parameter only appears when two compasses are used.
Note !
When two compasses are used (main compass and monitor
compass), there is virtually always a difference between the readings
of the two. The difference is displayed under the COMP. DIFF. in the
information display. To ensure that the limits of the off-course alarm
are symmetrical about the course to steer (set course), press the
INCREASE button to cancel any difference between the two compass
readings.
The difference between the two compass readings may vary with the vessels
Note !
heading and from one area to another where a vessel is in transit. The
difference between the two compass readings is automatically reset when the
COMP DIFF. alarm is given and the ALARM RESET button is pressed.
5-38
50s - 1550s in 50s increments
GYROADJUST
PRESS INC
COMP DIFF
PRESS INC
(DEC)
20169223D
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