33 U.S.C. § 1606

(a) The Secretary of the Navy is authorized to promulgate special rules with respect to additional station or signal lights or whistle signals for ships of war or vessels proceeding under convoy, and the Secretary of the department in which the Coast Guard is operating is authorized to promulgate special rules with respect to additional station or signal lights for fishing vessels engaged in fishing as a fleet. (b) The additional station or signal lights or whistle signals contained in the special rules authorized under subsection (a) of this section shall be, as far as possible, such that they cannot be mistaken for any light or signal authorized by the International Regulations. Notice of such special rules shall be published in the Federal Register and, after the effective date specified in such notice, they shall have effect as if they were a part of the International Regulations.