Busy shipping lanes.
Failure of communications equipment
Failure to acknowledge signals
misunderstanding of international recognition.
A possible list of reasons but still difficult to understand !
Certainly difficult for me to understand, My humble Honda has got warning systems that will tell me when I'm about to bump into something, I find it difficult to imagine than a mutli-billion dollar warship hasn't - and that even if they aren't working, they surely have chaps looking out the front to see what's going on?
