Which vessel are enforced to have a whistle?

Vessels that are required to have a whistle include all vessels over 12 meters (39.4 feet) in length, as mandated by the International Regulations for Preventing Collisions at Sea (COLREGs). Additionally, vessels engaged in towing or pushing operations, as well as certain specific types of ships, may also be required to have a whistle for signaling purposes. The whistle is an essential safety feature for communication between vessels and for alerting other vessels of their presence.