While in the District of Columbia, registration and titling are required for non-run vessels. USCG documented vessels have to even be registered and titled. Outboard motors don't require titling, but trailers need to be titled. Yachts more than 10 years old has to be inspected inside a thirty day period https://dallaswekqw.azuria-wiki.com/1059144/not_known_facts_about_san_marino_yacht_registration