S&R - my view (and I think that of some others) is that this APBSS routing was not created for these SAR aircraft as an approach to Blacksod, but is just a long established old VFR route between two lighthouses, Blacksod and Blackrock. Which is why it has route direction arrows each way and no vertical profile info. As I think ? Crab/DB/Punto said, it makes no sense as a VFR approach to go 10 miles further west than necessary, and it cannot be an IFR approach without a vertical profile. I suspect its use was just because it existed and then it was melded with a standard SAR let down to 200ft without enough thought, aggravated by the crew's local unfamiliarity and rushing to launch.