What does a long blast every 2 minutes indicate for a powered vessel?

A long blast every 2 minutes serves as an auditory signal indicating that a powered vessel is not making way through the water. This sound signal, typically produced by the vessel's horn, is used to communicate its status to other mariners. When a powered vessel is in the water but unable to move, the long blast is employed to indicate that it is facing difficulty but is still afloat.

In navigation regulations, particularly those outlined in the International Regulations for Preventing Collisions at Sea (COLREGs), such signals play a critical role in ensuring safety at sea by alerting other vessels to the situation. Understanding the purpose of these sound signals is vital for effective navigation and ensuring the well-being of all vessels in close proximity.