Heartbreaking reading the CVR transcript. One line in the interim report stands out though and probably confirms what most of us were thinking;
"The CVR recording contains no reference by the Crew to the presence of a lighthouse or terrain at Black Rock during their briefing for APBSS.”
I'm somewhat surprised that Blackrock wasn't in the terrain database. For a fleet of helicopters expected to conduct SAROPS anywhere in the Irish SRR (and beyond), often in very poor weather conditions/in the dark, that seems remiss.