26. AUTOPILOT OPERATIONS
26-34
Low speed
Lost communication between Autopilot and ECDIS and vice versa
*1
PT-500A: CAUT ALM; PR-6000: RC; FAP-2000, FAP-3000, PR-9000: ALARM
Position discrepancy (position from only one GPS navigator is reliable)
*1
For IEC 62065 Ed. 2 complying autopilots (PR-9000), the sequence is different. For
example, two GPS navigators are onboard and one exceeds the discrepancy limit.
Then, the alerts "30500 Sensor Banned" and "154 Position Monitor" appear.
Associated
alerts
Expected system
performance
Operator
action
• Alert "159 Low Speed
Alarm".
• Acknowledge alerts.
• Monitor situation.
Associated
alerts
Expected system
performance
Operator
action
Within 15
seconds
• Alert "30852 AP Re-
ceive Error" is generat-
ed at the ECDIS.
Guidance for the naviga-
tor
• Acknowledge alerts.
• Monitor situation.
After Alert
"30852 AP
Receive
Error"
• Alert "153 Track Con-
trol Stop"* is generated
at the ECDIS. Track
control is stopped and
the lamp
*1
on the Auto-
pilot’s Steering Control
Unit lights.
*Transferred to BNWAS if
not acknowledged within
30 seconds.
TCS stops and
• If the ship is running
straight, actual heading
is used as set course.
• If the ship is turning,
last set course and radi-
us are used to complete
the turn.
• Acknowledge alerts.
• Monitor situation.
• Change the steering
mode to AUTO.
Associated
alerts
Expected system
performance
Operator
action
Precondition • If sensors in Filter calcu-
lation are NOT inside
operator selected posi-
tion discrepancy limit,
Alert "30500 Sensor
Banned" appears.
*1
• Monitor situation.
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