Route Navigation; Setting The Waypoint Arrival Circle - Simrad AP50 Operator's Manual

Simrad AP50 Autopilot
WP: WP2
100°
BWW
035°
Chg.
OK? press NAV
NEXT WP
WP2
135.
7
102
°T
BPW
Gyro1
02.2
DST
NM
NAV
SETUP
Note !
22

Route Navigation

When operating the AP50 in NAV mode to automatically steer
through a route of waypoints, the AP50 will steer to the first
waypoint in the route after you accept the first waypoint as the
location to steer towards.
If you use a GPS/Chart plotter, the AP50 will, when you arrive at
the waypoint arrival circle, output an audible alarm and display
an alert screen with the proposed new course information. If the
required course change is more than 10°, you will need to verify
that the upcoming course change is acceptable.
Verification is performed by pressing the NAV button or turning
the course knob after the alert screen is displayed. If an external
alarm unit (optional) is connected to the AP50 system, an alarm
is given after 5 seconds. If no verification is received, the AP50
will continue on the current set course in NAV mode.
Regain manual steering at any time by pressing the
button.
If "END ROUTE" is used as final WP-name, an "End of route"
warning will be given on the active control unit when arriving at
the final WP.
If the AP50 is connected to a navigation receiver that does not
transmit a message with the bearing to the next waypoint, it will
pick a Cross Track Error message and steer on Cross Track
Error only. In that case you have to revert to AUTO mode at
each waypoint and manually change the set course to equal the
bearing to the next waypoint and then select NAV mode again.

Setting the waypoint arrival circle

For route navigation it is recommended to use automatic
waypoint shift/change at a set waypoint arrival circle.
The arrival circle should be adjusted according to boat speed.
The higher speed, the wider circle. The intention is to make the
autopilot start the heading change in due time to make a smooth
turn onto the next leg.
Origin
WP1
Waypoint arrival circle
(determined by the navigator)
The new heading is accepted
automatically after the
NAV/SETUP button is pressed
(STBY)
STBY
WP2
20221032 / E