Appendix B Alert List
B-2 
 
The list of alert messages by alert type is shown below. 
 
B.1  Alarms 
Message  Explanation 
Collision avoidance function lost 
The collision avoidance function cannot be executed 
due to a failure or a communication error of sensor or 
radar antenna. 
CPA/TCPA(AIS)  CPA/TCPA alarm (AIS) 
CPA/TCPA(TT)  CPA/TCPA alarm (TT) 
Cross Track 
The off-track distance from the planned route exceeded 
the limit. 
Depth below keel  The depth below keel is too shallow. 
Dragging anchor  The ship has left the dragging anchor monitoring area.