Sound signals in maritime operations are mandatory for which type of vessels?

In maritime operations, sound signals serve as an essential means of communication, particularly for safety and navigation purposes. Manned vessels are required to use sound signals under specific circumstances, such as during limited visibility, when maneuvering, or when at anchor. These signals help to convey a vessel's actions and intentions to others in the vicinity, thereby promoting safety and avoiding potential collisions.

Manned vessels are defined as those that have crew onboard, which enables them to respond to changing conditions and communicate effectively with other vessels. In contrast, unmanned vessels may not have the capacity to use signals, as they operate autonomously without a crew to make decisions or convey intentions through sound.

While certain sound signals may also be applicable to fishing vessels, they are part of the broader category of manned vessels. Thus, the requirement for sound signals universally applies to all manned vessels, reinforcing the importance of communication in maintaining safety on the water.