Operation
20169223D 2-17
2. Read the calculated bearing to waypoint from the Nav. receiver.
3. Set the course to the waypoint showed on the navigation receiver.
Before going to step 4, ensure that the XTE is within 0.1 n.m. to
avoid a hazardous course change when selecting NAV-mode.
4. Select NAV-mode on the AP9 MK3. The autopilot now
automatically changes the set course to reduce the Cross Track
Error (XTE) to zero. The information display shows the number of
degrees the autopilot has changed the set course, and the XTE in
1/1000's of a nautical mile. Note that the display read-out will be
delayed, depending upon the NAV. FILTER setting.
Note ! The accuracy of the autopilot depends on the accuracy of the GPS and it’s
output.
Example:
NAVIGATING
05 XTE = R0.021N
R indicates that the vessel is located to the right of the bearing line,
and L indicates to the left of the bearing line.
05 is the number of degrees course change relative to initial set
course. As the vessel approaches the bearing line, the correction
value decreases and when the vessel is on track, the information
display shows:
NAVIGATING
00 ON TRACK
5. As the vessel gets within the arrival circle set on the navigational
receiver, or as the vessel passes the perpendicular line to the
waypoint, the receiver transmits a "data not valid" signal to the
autopilot. An audible alarm will then activate and the course to
steer will no longer be updated.
To proceed to the next waypoint, the procedure should be repeated
from step 2 onwards.
Procedure:
• Reset the alarm on the autopilot and navigational receiver.
• Select "AUTOPILOT" mode on the autopilot.
• Use Course Change knob/buttons on the autopilot and to
set the new course given by the Nav. receiver.
• Press "NAV"
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