What signaling equipment should be operable on board?

• A. A whistle or horn, and a VHF radio if required; ensure they’re tested prior to departure.
• B. A calendar
• C. A decorative flag
• D. An underwater beacon

Answer: (A)

Signaling devices on board must be operable to ensure you can alert others to your presence and communicate when needed. A whistle or horn provides an immediate audible signal, which is essential in crowded waters or in reduced visibility to warn nearby vessels or to get attention. A VHF radio is required if regulations call for it, and it enables direct two‑way communication with other boats, maritime authorities, and rescue services—crucial for routine traffic information and emergencies. Testing these devices before departure makes sure they work when you need them, including checking batteries, radios on the correct channels, and any required DSC functions. The other options don’t serve as proper signaling tools: a calendar is not a safety device, a decorative flag isn’t a regulated signal, and an underwater beacon is specialized gear not routinely required for general boating.