What type of distress signals must vessels on federally controlled waters carry?

Vessels operating on federally controlled waters are required to carry U.S. Coast Guard-approved visual distress signals. This requirement ensures that in the event of an emergency, such as a vessel becoming disabled or being in danger, the crew can effectively communicate their distress to nearby vessels and search and rescue services.

USCG-approved visual distress signals include a range of devices such as flares, flags, and lights specifically designed to be visible and recognizable as distress signals under various conditions. This is a critical safety measure to enhance the chances of timely rescue and assistance.

The other options focus on either restricting the type of signals to pyrotechnic or non-pyrotechnic, or imply that no distress signals are required. However, the comprehensive requirement for USCG-approved visual signals highlights the importance of having effective means of communicating distress on the water for safety and emergency response.