“Every vessel of 40 ft. (12.2 meters) or less in length must have some means of making an efficient sound signal. For vessels up to 40 feet in length, a handheld whistle, air horn or similar sound producing devices that is audible for 1⁄2 mile, may be used. Vessels greater than 40 feet must have a power-operated sound producing device that is audible for one mile and a bell.”