gulliBell
You could be right ref that the PIC thought the feature and waypoint were not co-located, but I'm not so sure. They were actually over the rocks that triggered the ALTITUDE alert just 0.65nm before Blackrock, not 1nm. Might not sound much different, but if the PIC's map scale was set so that the whole route into Blacksod was showing (or even much of it) I think it could have looked close enough for her to think those rocks and BLKMO were the same. Of course many of us are looking carefully at the fine detail now, but if we assume the crew weren't aware of the major hazard of this approach, given they had 10nm to run they might not have zoomed the map in to see fine detail until nearing Blacksod.