Mississippi Code Title 59. Ports, Harbors, Landings and Watercraft § 59-21-19

(1) The certificate of number shall be pocket-size, approximately two and one-half inches (2- 1/2 ″) by three and one-half inches (3- 1/2 ″), and water resistant.

(2) Pending the issuance of the original certificate of number, the owner of the vessel may be furnished a temporary certificate of number valid for sixty (60) days from the date of issue. This temporary certificate shall be carried on board when the vessel is being operated.

(3) Each applicant for an original or transfer certificate of number, who is entitled to issuance thereof, shall be issued a certificate for a period of three (3) years from the last day of the month of receipt of the original or transfer certificate. This subsection shall not apply to the certificate of number of a livery boat.

(4) The certificate of number of a livery boat shall be plainly marked “livery boat.” The description of the motor and type of fuel will be omitted from the certificate of number in any case where the motor is not rented with the boat. Original and renewal certificates of number of a livery boat shall be valid for a period of three (3) years and shall expire at midnight on June 30.

(5) Numbers and certificates of number awarded boats operated by manufacturers and dealers may be transferred from one (1) boat to another. In lieu of the description, the word “manufacturer” or “dealer,” as appropriate, will be plainly marked on each certificate. The manufacturer or dealer may have the number awarded printed upon or attached to a removable sign or signs to be temporarily mounted upon or attached to the boat being demonstrated or tested so long as the display meets the requirements of Section 59-21-9.