What type of signals are covered in Part D of the COLREGs?

Part D of the COLREGs specifically addresses the rules regarding sound and light signals, which are critical for communication between vessels to avoid collisions at sea. This section outlines how vessels should use these signals to indicate their intentions to one another, such as when passing, encountering, or when visibility is limited. The proper use of sound signals, like whistles or horns, and light signals, like navigation lights, plays an essential role in ensuring safety on the water.

Understanding this part of the regulations is fundamental for mariners to maintain effective communication and situational awareness, especially in busy waterways or during reduced visibility conditions. The other options do not align with the content of Part D; for instance, exemptions, conduct in sight of one another, and verification of compliance pertain to different aspects of maritime navigation and regulation compliance, rather than the specific signals used for communication.