In the District of Columbia, registration and titling are expected for non-driven vessels. USCG documented vessels must also be registered and titled. Outboard motors never call for titling, but trailers must be titled. It governs safety policies and inspections, and standardizes port procedures across member states. Twenty-7 countries are signatories, https://polishboatregistration64219.illawiki.com/1085788/facts_about_polish_boat_registration_revealed