Furuno FEA-2107 - Lost Differential Position

28. Trackpilot
28-33
28.9.7 Lost differential position
Goto track steering mode
Associated alarms (generated
at ECDIS)
Expected system performance What end user should do
• 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 “2492 Route: Needs
diff pos.”
• Goto Track requires
differential position.
• Acknowledge alarms.
• Study situation.
After 2
minutes and
then every 4
minutes
• Alarm “2505 Route: Use
Goto WP.”
• Guidance for navigator • Change to Goto WP
steering mode.
• Acknowledge alarm.
After 4
minutes and
then every 4
minutes
• Alarm “2492 Route: Needs
diff pos.”
• Reminder • Acknowledge alarms.
• Study situation.
Within 10
minutes
• Alarm “2489 Route:
Changed to Goto WP.”
• Automatic change of steering
mode to Goto WP mode.
• Acknowledge alarms.
• Study situation.
Program track steering mode
Associated alarms (generated
at ECDIS)
Expected system performance What end user should do
• 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 “2495 Progtrack:
Needs diff pos.”
• Program Track mode requires
differential position.
• Acknowledge alarms.
• Study situation.
After 2
minutes and
then every 4
minutes
• Alarm “2504 Progtrack:
Use Radius Ctrl.”
• Guidance for navigator • Change immediately
to local autopilot
control.
• Acknowledge alarm.
After 4
minutes and
then every 2
minutes
• Alarm “2503 ProgTrack:
Needs diff pos.”
• Reminder • Acknowledge alarms.
• Study situation.
Within 10
minutes
• Alarm “2496 ProgTrack:
Stop-Sensor fail.”
• Automatic change of steering
mode to Radius Control mode.
• If ship is in linear part, actual
heading is used as set heading.
If ship is in turn, last-set
heading and radius remain.
• Acknowledge alarms.
• Study situation.