30. Steering With TOKYO KEIKI Autopilot PR-6000
30-33
30.9.8 Lost differential position and position discrepancy
Associated alarms (generated
at ECDIS)
Expected system performance What end operator
should do
Precondition
• If sensors in Filter calculation
are NOT
inside operator
selected position discrepancy
limit.
• Alarm "2007 Position
discrepancy"
• Acknowledge alarms.
• Study situation.
• Alarm "4027…4031: Lost
DGPS" or "4012…4016:
Position equipment error"
• Acknowledge alarms.
• Study situation.
Within 90
seconds
• Alarm "2010 Filter: Pos
source changed"
• Acknowledge alarms.
• Study situation.
Within 30
seconds
• Alarm "2478 Route: Needs
good Pos"
• Acknowledge alarms.
• Study situation.
After 2
minutes
then every 4
minutes
• Alarm "2506 Route: Use
Auto control"
• Guidance for navigator • Change to local
autopilot control.
• Acknowledge alarms.
After 4
minutes
then every 2
minutes
• Alarm "2478 Route: Needs
good Pos"
• Reminder • Acknowledge alarms.
• Study situation.
Within 10
minutes
• Alarm "2497 Route Stop-
Sensor fail".
• Acknowledge alarms.
• Study situation.
After Alarm
"2497 Route
Stop-Sensor
fail."
• Alarm "2471 RC/NAV-TC
STOP - Use AUTO" in
ECDIS is generated. Warning
lamp RC turns on and
steering mode indicator lamp
RC start flashing in Autopilot
control panel.
• If ship is in linear part, actual
heading is used as set course.
• If ship is turning, last set course
and radius are used to complete
the turn.
• Acknowledge alarms
• Study situation.
• Change steering mode
to "AUTO".
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