N.Y. Comp. Codes R. & Regs. tit. 15, § 104.6
(f) Whenever a dealer issues a temporary registration the dealer must make application for registration (and certificate of title, if appropriate) to the commissioner on behalf of the registrant. Whenever a dealer transfers a boat which is required to be titled in this State and which is subject to a security interest, the dealer must make application to the commissioner for registration and title on behalf of the transferee. A dealer may make application for registration (and certificate of title, if appropriate) in this State for any other boat transferred by the dealer if the transferee agrees. In any case in which the dealer makes such application for registration (and certificate of title, if appropriate) in this State, the dealer must deliver to the transferee a copy of the application for registration, copies of all evidence of ownership, and the original of the bill of sale which he submitted to the commissioner. Whenever a dealer makes application for registration and/or title in this State on behalf of his transferee, such application to the commissioner must be made by mail to the central processing unit of the department.
(g) Bill of sale.
Every bill of sale issued by a registered boat dealer shall be consecutively numbered with a unique bill of sale identification number and shall contain the name and address of the dealer, the dealer's registration number, the name and address of the transferee, the boat registration number, if assigned by the dealer or previously issued for that boat, a complete description of the boat, including make, model year, hull identification number, hull material, length, type of propulsion, whether the boat is new or used, and a statement that all New York State and local sales tax has been collected.
(h) Temporary registrations.
A registered boat dealer will, upon request, be furnished with temporary registration certificates and a series of registration numbers by the commissioner which the dealer may assign upon the sale or transfer of a boat. After issuance of such temporary registrations, the dealer must mail a completed registration application, with appropriate documentation and the appropriate fee to the commissioner at the central processing unit of the department no later than five calendar days after the issuance of such temporary registration. He must provide the transferee with the temporary registration document properly completed in conformity with the instructions contained thereon. The dealer must also assign a registration number from the series assigned to the dealer by the commissioner, unless the boat being transferred was previously registered and numbered in this State.
(i) Required records.
(j) If a person acts as both a boat dealer and a yacht broker, such person must both register as a boat dealer and certify as a yacht broker and must keep separate records as a dealer and as a yacht broker, including separate books of registry for each function.
(k) Dealer demonstrator numbers.
Upon request, the commissioner shall assign a series of demonstrator numbers to a registered boat dealer together with a set of two validating stickers for each such number assigned. The number of demonstrator numbers to be assigned can be limited in the discretion of the commissioner. It shall be the dealer's responsibility to fabricate each such number assigned in conformity with the dimensions required for registration numbers set forth in subdivision (3) of section 2253 of the Vehicle and Traffic Law in such a manner that such numbers can be temporarily affixed to any boat owned or controlled by the dealer and held for sale, for the purpose of sale or demonstration. Such numbers, together with the validating stickers shall be temporarily affixed to the boat being used for demonstration at the same locations that regular registration numbers and validating stickers are attached.