Condolences to the deceased. Tragic that a relatively straightforward cross-country run to a station refuel would end like this.
Always looking at the benefit and alignment of modern technology for rescue purposes. As far as I know, most helicopters these days are satellite tracked, typically pinging every 2 minutes with an accuracy of 60'. With the benefit of AIS near shorelines of developed countries the frequency is more like 2-10 seconds and an accuracy of 6'. Some media have commented on lack of a rescue signal, PLB's require activation and the circumstances may not have lent themselves to that. CPI should be automatic but predictably it once again failed. For their burden of cost, installation and weight, I'd be more heartened to hear of a single ditching where they actually worked as advertised.
CVR/FDR have a sonic pinger that will transmit for about 30 days underwater. Hope the proximity to Blackrock is only a coincidence.