What is required on a federally controlled waters for boats less than 39.4 feet?

Boats less than 39.4 feet operating on federally controlled waters must be equipped with certain safety gear, including a personal flotation device (PFD) for each person aboard, a sound-producing device like a horn or whistle, and visual distress signals for nighttime use. Additionally, boats are required to have a fire extinguisher if they have an enclosed engine compartment. It's also important to comply with any specific state regulations that may apply.