29. Steering With Yokogawa PT-500A
29-21
<Continued from previous page>
Associated alarms Expected system
performance
What end user should do
After Alarm
“2497 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.
29.8.7 ECDIS lost messages from Autopilot
Associated alarms Expected system
performance
What end user should do
Within 15
seconds
Alarm “2488 Steering: Stop-
system fail” generated at
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.
I 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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