29. Steering With Yokogawa PT-500A
29-15
29.8.2 Lost heading from ECDIS (Autopilot still has heading)
Associated alarms Expected system performance What end user should do
Sensor alarm, for example
Alarm “4005: Gyro error” or
“4006: Gyro error.”
Acknowledge alarms.
Study situation.
Within few
seconds
Alarm “2002 No heading
available” and alarm “2000
Filter: position Unreliable”.
Alarm “2497 Route Stop-Sensor
fail”
Acknowledge alarms.
Study situation.
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.
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