If a vessel is over 100 meters in length, what signaling equipment is required?

• A. Automatic identification system
• B. Long-range radio with distress channel
• C. Sound signaling device such as a gong
• D. Radar transponder

Answer: (C)

A vessel must be able to produce audible signals to indicate its presence and intentions, especially in restricted visibility. A sound signaling device, such as a whistle, horn, or gong, provides that basic means of communication and is a universal requirement for vessels, regardless of other equipment or voyage type.

The other items are governed by different rules and depend on voyage, tonnage, or international obligations. AIS, long-range distress radios, and radar transponders are required under specific regulations (GMDSS and SOLAS) for certain ships and situations, but the essential, always-required signaling capability tied to the basic rules of the road is the sound signaling device.