Section 41-13-103 - Motorboats to be numbered; exempt motorboats(a) A motorboat shall not be required to be numbered under this act if it is: (i) Already covered by a number in full force and effect which has been awarded to it pursuant to federal law or a federally approved numbering system of another state. Provided, that such boat shall not have been within this state for a period in excess of ninety (90) consecutive days; (ii) Presently numbered under the rules of the department until the present registration expires and provided further, that present coast guard numbers shall be specifically recognized for their duration or until the certificate expires, whichever is first; (iii) A motorboat whose owner is the United States, a state or a subdivision thereof, but such ownership must be visibly evident; (iv) A motorboat belonging to a class of boats which has been exempted from numbering by the department after said agency has found that the numbering of motorboats of such class will not materially aid in their identification; and, if an agency of the federal government has a numbering system applicable to the class of motorboats to which the motorboat in question belongs, after the department has further found that the motorboat would also be exempt from numbering if it were subject to the federal law.