All this really proves is that it's probably not helpful to merge the concept of top cover with the OP's rightful anger at current issues within Irish SAR.
I will always have immense respect for the outstanding courage and professionalism of SAR crew but since you've chosen to be rude, Albert, it must be pointed out that almost all your responses to my "inane" question have been overtaken by the march of technology; are comms relays/HF coverage really relevant in the SATCOM era, ditto for radar updates vs. marine AIS? Discussing this with a civilian SAR union colleague, he said that he'd love "top cover" ...but had never taken part in a rescue in which it played a part.