Is the statement regarding sound signaling equipment mandatory for vessels true?

The statement regarding sound signaling equipment being mandatory for vessels is correct because the COLREGs (International Regulations for Preventing Collisions at Sea) establish specific requirements for sound signaling devices for all vessels. These regulations ensure that vessels can communicate their presence and intentions effectively, especially in conditions of restricted visibility or when navigating near other vessels. The use of sound signals helps in the prevention of collisions and enhances safety at sea.

Every vessel is required to have some form of sound signaling equipment on board, which can include whistles or horns, and the type and capability of the equipment may vary based on the size of the vessel. This requirement is crucial for maintaining awareness and facilitating navigation, particularly in crowded or busy waterways.

The other options suggest varying degrees of applicability or exceptions, which do not align with the comprehensive nature of sound signaling regulations in maritime contexts. All vessels, regardless of their type or operating conditions, must comply with the mandatory requirements outlined in the COLREGs related to sound signaling equipment.