New York State requires that all motorized boats, including sailboats with auxiliary engines, must be registered in the state in order to operate legally. The requirements for registering a boat depend on the type of vessel. Sailboats: All sailboats, regardless of length, must be registered with the New York State Department of Motor Vehicles. Vessels with Motors: All motorized vessels that are 18 feet or longer must be registered with the NYS Department of Motor Vehicles. Personal Watercraft: All personal watercraft with a motor of 10 horsepower or more must be registered with the New York State Department of Motor Vehicles. Registration Renewal: Boat registrations in New York are valid for three years. The vessel owner must renew the registration before the expiration date. Fees: Registration fees vary depending on the type of vessel, size, and motor horsepower. Registration Documents: In order to register a boat in New York, the vessel owner must provide proof of ownership, such as a bill of sale, and fill out a registration application.