What is the minimum audible range of a whistle fitted to a vessel greater than 200m or more in length?

The minimum audible range of a whistle fitted to a vessel greater than 200 meters in length is established to ensure adequate warning signals can be heard by other vessels, especially in conditions of reduced visibility or busy waterways. The correct answer of 2500 meters reflects the guidelines set by the International Regulations for Preventing Collisions at Sea (COLREGs), which are designed to promote safe navigation.

This requirement emphasizes the importance of a vessel's sound signaling system to prevent collisions. A whistle capable of being heard from this distance provides a significant safety measure, allowing vessels to understand each other's positions and intentions effectively. Given that larger vessels operate in areas where they may encounter other ships and need to communicate potential maneuvers, the need for an audible range of this magnitude is crucial for maritime safety.

In considering other options, while 1500, 2000, and 3000 meters are substantial distances as well, they do not meet the specific regulatory requirements set forth for vessels of this size. Thus, 2500 meters is the correct standard that must be adhered to for vessels greater than 200 meters.