Appendix 5 - Classification of Alerts
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.252(83) - Adoption of the Revised Performance Standards for Integrated Navigation Systems (INS) - (Adopted on 8 October 2007) - Annex - Performance Standards for Integrated Navigation Systems (INS) - Appendix 5 - Classification of Alerts

Appendix 5 - Classification of Alerts

 For the purpose of transferring requirements for alarms and indications of existing individual performance standards into 3 priority classes of alerts within the INS performance standard, the alarms of the individual performance standards are subdivided into two classes of alarms being alarms and warnings in the INS performance standard.

Table 1 Classification of INS alerts as specified in these performance standards

Source Cause Alarm Warn. Caut. Categ. A Categ. B
INS System function lost X       X
Integrity verification not possible (5.5.5)   X     X
Invalid information for functions in use (5.3.1.2)   X     X
Invalid information for functions not in use (5.3.1.2)     X   X
Different thresholds entered (5.4.3.3)     X   X
Loss of system communication (12.6.2)   X     X

Table 2 Classification for INS for alerts specified in the individual equipment performance standards

Source Cause Alarm Warn. Caut. Categ. A Categ. B
Heading control systems Failure or reduction in power supply X       X
Off heading alarm   X   X  
Heading monitor (deviation from second heading source)   X     X
Track Control systems Early course change indication (track control via waypoints)   X   X  
Actual course change indication   X   X  
Wheel over line (actual course change indication not acknowledged) X     X  
1) alarm      
2) back-up navigator alarm      
Failure or reduction in power supply   X     X
Position monitor   X   X  
Heading monitor   X   X  
Sensor failure (heading, position, speed) X       X
1) alarm
2) back-up navigator alarm
Cross-track alarm X     X  
Course difference (heading deviates from track course)   X   X  
Low speed alarm   X     X
ECDIS Positioning system failure   X     X
Crossing safety contour X     X  
Deviation from planned route - off-track alarm X     X  
Area with special conditions - cross the boundary   Xfootnote Xfootnote X  
Approach to critical point   X   X  
Different geodetic datum   X     X
System malfunction   X     X
(system malfunction of backup device)   X     X
RADAR/AIS Target capacity   X   X  
CPA/TPCA alarm X     X  
Acquisition/activation zone   X   X  
Lost target alarm   X   X  
Failure of any signal or sensor in use   X     X
GNSS HDOP exceeded     X   X
No calculation of position         X
Loss of position   X     X
Loss of differential signal   X     X
Differential corrections not applied   X     X
Differential integrity status   X     X
Echo sounder Depth below keel alarm X     X  
Failure or reduction in power supply   X     X
Gyro compass System fault   X     X
Bridge watch alarm Malfunction   X     X
Power supply failure   X     X
Parent topic: Annex - Performance Standards for Integrated Navigation Systems (INS)
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