If your vessel is less than 65.6 feet long (including PWCs) and operating federally controlled waters in Mississippi what sound-producing device(s) must be carried?

If your vessel is less than 65.6 feet long and operating in federally controlled waters in Mississippi, you must carry a sound-producing device such as a whistle or a horn. This device is required to signal your presence in instances where visual communication may not be sufficient. Additionally, vessels must also comply with any specific regulations that may apply to the area of operation.