Boat registrations in Maine are (or used to be) done at the town Clerk''s office, with a dept. of Inland Fisheries and Wildlife sticker - dedicated funds as with snowmobiles, etc. I don''t think you could record any kind of a lien. Thing is, CG documentation gives the lender the ability to check any liens, ownership history, etc. in roughly the same manner as with a register of deeds in real estate. I believe the rationale from the lender is that they have a third party doing the procedure who will carry some level of liability if the title history ultimately proves defective in any way.