During one of his talks, Harrison again declared that he was 100% certain he had seen Tristans during the cruise, and said, "If you think you've seen a Tristan, you probably have, and if anyone asks how you can be sure, tell them, 'because Peter Harrison said so'! " 
According to my bird guide, adult males have a mostly dark upperwing with a pale elbow patch, but less black in the tail tip than Wanderers. Peter Harrison also talked about the pale elbow patch. Using these descriptions, I think this may be a Tristan
, and also because Peter Harrison said so!! 
I always seemed to be in the wrong place at the wrong time. 
Always something to see!! 
