Operator's Manual

26. AUTOPILOT OPERATIONS
26-28
Total lost position (position from ALL GPS navigators is unreliable)
*1
PT-500A: EMRG ALM; PR-6000: RC; FAP-2000, FAP-3000: ALARM
Associated
alerts
Expected system
performance
Operator
action
Precondition • Alert "290 EPFS1 COM
Error" (example).
OR
• The Kalman filter de-
tects position jump, etc.
• Acknowledge alerts.
• Monitor situation.
Within 30
seconds
• Alert "156 Sensor Fail-
ure"
• Alert "170 Positioning
System Failure".
• Alert "900 No Filter
Source of Position".
• Alert "901 No Filter
Source of COG/SOG".
• The Kalman filter is
turned OFF and the
system uses dead
reckoning for position-
ing.
• If you have a log or
dual-axis log, then
dead reckoning is
based on them and the
gyro.
• If you have a log or
dual-axis log, then
dead reckoning is
based on last valid
speed from position
sensors.
• Acknowledge alerts.
• Monitor situation.
Repeated
every two
minutes
• Alert "675 Use MAN
Steering"
Guidance for navigator • Change immediately to
local Autopilot control.
• Acknowledge alerts.
Within 10
minutes
• Alert "153 Track Con-
trol Stop"* and Alert
"156 Sensor Failure"
are generated at the
ECDIS. The lamp
*1
on
the Autopilot’s Steering
Control Unit lights.
*Transferred to BNWAS
if not acknowledged
within 30 seconds.
TCS stops and
• If the ship is running
straight, actual head-
ing is used as set
course.
• If the ship is turning,
last-set course and ra-
dius are used to com-
plete the turn.
• Acknowledge alerts.
• Monitor situation.
• Change the steering
mode to AUTO (HEAD-
ING CONTROL on
FAP-3000).