A flock of birds fishing around the boat, about the size of a small thrush
No interactions present.
Whilst these birds do look like Brown Noddies the size should be much bigger than even a Mistle Thrush.
Further to my last comment. I have found that birds generally look smaller at sea until you manage to get one on deck. Not much to compare them too in the deep blue yonder!
Lat/Lng: -0.4124, -91.4821