29. Steering With Yokogawa PT-500A
29-22
29.8.8 Autopilot lost messages form ECDIS
Associated alarms Expected system performance What end user should do
Within 15
seconds
Alarm “2488 Steering: Stop-
system fail” and “2480
Trackpilot Receive error” is
generated at the ECDIS.
.
Acknowledge alarms.
Study situation.
After Alarm
“2488 Route
Stop-Sensor
fail.”
If vessel is in linear part of
route alarm “2471 AP mode
conflict - Use AUTO” in
ECDIS and alarm
“CAUTION-01 CHANGE TO
AUTO” on Autopilot control
panel
If vessel is in turning part of
route alarm “2515 Conflict-
NAVI compl. Turn” in ECDIS
and alarm “CAUTION-01
NAVI COMPL TURN” in
Autopilot control panel. After
the turn is completed the alarm
changes in ECDIS as “2471
AP mode conflict - Use
AUTO” and in Autopilot
control panel as “CAUTION-
01 CHANGE TO AUTO”
If ship is in linear part, actual
heading is used as set heading.
If ship is turning, last-set heading
and radius are used to complete the
turn as long as Autopilot mode
selector is kept in position “NAVI”..
Acknowledge alarms
Study situation.
If vessel is in linear part then
Change steering mode to
AUTO.
If vessel is in turning state,
then either keep steering
mode NAVI to complete the
turn or change to steering
mode AUTO to stop turning.
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