What is typically used by ships to produce a loud sound?

The choice of a ship's gong as a device typically used to produce a loud sound is relevant in specific contexts on a vessel. Gongs can be employed as an audible alert system, especially in certain navigational circumstances, signaling situations on board, or during specific maritime ceremonies. However, while gongs do produce sound, they are not the most common or primary tools for signaling distress or warnings at sea.

In contrast, other options like a whistle, fog horn, or signal cannon are more commonly used specifically for alerting or signaling purposes. A whistle is often used for short-distance calls or commands, a fog horn serves as a navigational aid in low visibility conditions by emitting a loud, recognizable sound over great distances, and a signal cannon is utilized for ceremonial purposes or as an emergency signal.

This makes the choice of a ship's gong less relevant as a primary instrument compared to the other devices listed that focus explicitly on navigation and distress signaling.