What is the requirement for equipment used for bell and gong signals?

The correct answer highlights that equipment used for bell and gong signals must have the capability to be sounded both manually and automatically. This dual functionality is essential for distress signaling because it allows for versatile communication methods in emergency situations.

Manual operation ensures that crew members can generate signals when immediate responsiveness is needed, especially if they are within reach of the equipment. Automatic capabilities, on the other hand, allow for signals to be produced without direct human intervention, which is crucial when a vessel is incapacitated or if crew members are unable to operate the equipment due to a variety of circumstances.

Having this requirement strengthens safety protocols at sea, ensuring that vessels can effectively send distress signals under various operational conditions. Therefore, equipping vessels with systems that can function in both manners enhances the overall safety and preparedness for emergencies on the water.