Alpha22
Well-Known Member
This VHF radio site is of some use for checking whether names are available, a "g" in the end columns denotes a UK registered vessel. I think it includes boats that are only SSR registered though, so there's some guesswork involved by looking at the ships particulars and trying to work out whether it will be on Pt 1 or not.
http://www.itu.int/online/mms/mars/ship_search.sh
I'm fairly confident that the data on the Mars site comes from the Ofcom radio licence for the the boat. I have had boats that were neither Pt1 or SSR and never had been, and a month after setting up the VHF licence they popped up on the Mars site.