Which rule outlines the requirements for sound signal equipment in COLREGs?

Rule 33 of the COLREGs specifically details the requirements for sound signal equipment on vessels. This rule establishes the necessity for vessels to be equipped with sound signal appliances that can produce audible signals to communicate their presence or intentions, especially in reduced visibility conditions.

According to Rule 33, vessels must have a means of producing sound signals that can be heard over the surrounding noise of the marine environment. This includes requirements for maintaining a proper operational condition of the equipment. The rule covers specifics about the types of sound signals that must be made under certain circumstances, especially regarding navigational safety and the prevention of collisions.

This focus on sound signals is crucial for ensuring that vessels can adequately signal their status and intentions to others, thereby enhancing safety in maritime navigation.