Massachusetts fine points
The way the law is written, one applies for a certificate of number, and that is registered to a particular person/vessel. The word "registration" hardly appears in the text of MGL 90B. To be specific, if you consult 90B sec. 1, Definitions, you will find:"“Certificate of Number”,—a document issued by the director, upon application therefor, stating the name and address of the owner of, and the number awarded to a vessel subject to this chapter, except such vessels, other than livery boats, owned by a manufacturer of or dealer in boats."This numbering is required by MGL and is handled by the environmental police, I recall. Titling is prescribed in CMR (Code of Massachusetts Regulations). THe exemptions for numbering (i.e., registration), and titling under MGL and CMR, respectively, are quoted in my previous reply.By the way, just so you know - I sail all over Massachusetts, and in any given harbor (including my own), sailboats in the 30+ foot class with a local hailing port will more than likely not have a registration sticker or number on them. This is not the case in Rhode Island, as you well know.On the other hand, while in the past a tender with a motor 2HP or less used only as a tender for a yacht was exempt, now they all require registration; mine is numbered and sticker, 'though the sticker isn't sticking very well this year! Many seem to ignore this requirement, as it is rare to see a dinghy with numbers and a current sticker.