What does Rule 36 require concerning signaling?

Rule 36 of the COLREGs is concerned with the use of signals in certain situations at sea. The requirement to adhere to visual and auditory signaling protocols to communicate intentions is fundamental for maintaining safety and preventing collisions. This rule essentially underscores that vessels must signal their actions and intentions clearly, especially in situations where avoiding a collision or maintaining safety relies on effective communication.

The articulation of signaling both visually (e.g., by using lights or flags) and audibly (e.g., through sound signals such as whistles or horns) allows vessels to convey their maneuvers or intentions to others nearby, which is vital in a busy maritime environment. This clear signaling helps in maintaining situational awareness among vessels operating in close proximity and enhances cooperation among mariners, thereby reducing the potential for misunderstandings that could lead to dangerous situations.

In contrast, signaling only in distress, during daylight hours, or avoiding signaling altogether does not align with Rule 36, as it would hinder effective communication at sea. The rule emphasizes the importance of being proactive in signaling to ensure safe navigation, regardless of the time of day or the perceived need.