For a vessel over 20 meters in length, which signaling equipment is required?

• A. Whistle and Bell
• B. Gong
• C. One short blast
• D. Whistle, Bell, and Gong

Answer: (A)

Sound signaling devices are required on larger vessels to communicate intentions and alert other mariners. For a vessel over 20 meters, the minimum mandated signaling equipment is a whistle and a bell. The whistle lets you emit standardized signals to convey maneuvers and intentions at a distance, while the bell provides a reliable audible signal in conditions of reduced visibility or at night to indicate the vessel’s presence. A gong is not required for this length, and a “one short blast” describes a type of signal you can produce with the whistle rather than an additional piece of equipment. So whistle plus bell covers the required gear.