What is the minimum audible range of a whistle on a vessel greater than 20m in length but less than 75m?

The correct minimum audible range of a whistle on a vessel greater than 20 meters in length but less than 75 meters is 1000 meters. According to the International Regulations for Preventing Collisions at Sea (COLREGs), the standards for sound signaling appliances establish this specific minimum range for vessels within this length category.

This requirement is critical because it ensures that vessels can effectively communicate their presence and intentions to other vessels, especially in conditions of reduced visibility. Sound signals are an important aspect of maritime safety, helping to prevent collisions at sea.

The minimum audible range is determined based on the need for vessels to be heard at a distance sufficient to provide adequate warning to nearby vessels of their maneuvering conditions, thereby promoting safe navigation. Understanding these regulations is essential for anyone in maritime operations, as they enhance navigation safety and reduce the risk of accidents at sea.