Installation
20169223D 5-71
Navigational Steering test
Note ! Navigational steering must only be used in open waters.
Do the following check out before using navigational steering:
•
The autosteering must be tested and found satisfactory.
•
Any difference between the autopilot's magnetic compass course
(course sensor) and the course displayed on the Nav. receiver
should not exceed 5°. This is checked by steering on a straight
course for 5-10 min. with the autopilot in AUTO mode and Nav.
receiver in operation.
Note ! During poor reception conditions, the receiver transmits an alarm warning
which activates the alarm circuit in the autopilot. The set course reference is
not updated until the reception conditions improve. See Fault Warnings on
page 6-1.
Now use the following procedure:
1.
Set the Nav. receiver to calculate the distance and heading to a
destination waypoint by following the manufacturers instruction
manual. Make sure you have set up the receiver to calculate from
your present position to the waypoint or to the first waypoint in a
route.
2.
Read calculated course heading (CTS) to the destination or first
waypoint from the receiver.
3.
Select AUTO-steering and set the course selector to this course
(CTS).
4.
Let the autopilot steer the boat for a period of from 30 second to
one minute to allow the receiver to settle on the new course that
you are heading.
5.
Reset the receiver to calculate from your new present position to
the destination waypoint. This step is required to set the cross
track error to zero before you change to NAV mode on the AP9
MK3. Failure to reset the receiver will cause the autopilot to pull
radically off course when you first switch to NAV. mode.
6.
Set the AP9 MK3 to in NAV. SYSTEM mode. The autopilot will
now automatically change the selected course to reduce any cross
track error that the receiver senses, thereby steering the boat
directly to the destination waypoint. This communication between
the receiver and the autopilot is a slow acting process that takes
time to respond. Distance between waypoints should therefore be
of minimum 5 n.m. Otherwise there may not be sufficient time for
the system to detect any XTE, and for the autopilot to alter the
course to bring the boat onto the track line again.
7.
If a number of track lines are entered in advance and these are
continuously selected, then the AP9 MK3 must be returned to
AUTO position between each course change and the procedure
followed from step 2 and onwards.
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