Furuno FEA-2107 - Page 496

29. Steering With Yokogawa PT-500A
29-18
29.8.5 Total lost position
Associated alarms 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
If vessel is in linear part of
route alarm “2506 Route:
Use AUTO control”
If vessel is in turning part of
route alarm “2514 Route:
NAVI complete turn”
Guidance for navigator Acknowledge alarms.
Study situation.
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.
After 4
minutes and
then every 4
minutes
Alarm “2475 Route Needs
filter ON”
Reminder Acknowledge alarms.
Study situation.
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.
Within 10
minutes
Alarm “2497 Route Stop-
Sensor fail.”
Acknowledge alarms.
Study situation.
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