28. Trackpilot
28-32
28.9.6 Total lost position
Associated alarms (generated
at ECDIS)
Expected system performance What end user should do
• Alarm “4012…4016:
Position equipment error”
OR
• Kalman filter detects jump,
etc.
• Acknowledge alarms.
• Study situation.
Within 30
seconds
• Alarms “2000 Filter:
Position unreliable” and
“2006 Route: Course jump
possible.”
• Kalman Filter is switched Off
and system uses dead
reckoning for positioning.
• If you have log or dual-axis
log, then dead reckoning is
based on them and gyro.
• If you have log or dual-axis
log, then dead reckoning is
based on last plausible speed
from position sensors. This is
indicated by showing own ship
position, SOG and COG in red.
The source indication for SOG
and COG is “(LAST)”.
• Acknowledge alarms.
• Study situation.
After 2
minutes and
then every 4
minutes
• Alarm “2506 Route: Use
Radius control” or “2504
Progtrack: Use Radius
Ctrl.”
• Guidance for navigator
• Change immediately
to local autopilot
control.
• Acknowledge alarms.
After 4
minutes and
then every 4
minutes
• Alarm “2475 Route Needs
filter ON”, or “2493
Progtrack: Needs filter
ON.”
• Reminder • Acknowledge alarms.
• Study situation.
Within 10
minutes
• Alarm “2496 ProgTrack:
Stop-Sensor fail” or Alarm
“2497 Route 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 turning, last-set
heading and radius remain.
• Acknowledge alarms.
• Study situation.
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