O'leary. What's becoming clear is that BLKMO didn't appear as a target (which they would have avoided), it most likely appeared as a caption for BLKMO (which they were aiming for) which happened to be obscuring the target.
I considered that possibility. The radar we used was primitive and had a simple black/orange display but even with sea or ice clutter we could still clearly define shoreline and islands. The only thing I can think is that somehow they had their MFDs set up incorrectly - but how would that be possible given the experience level of the crew?