What does a prolonged blast mean every two minutes when boating?

A prolonged blast every two minutes while boating typically serves as a signal for other vessels, indicating the presence of a vessel that is either underway or restricted in its ability to maneuver. This sound signal is essential for safety, particularly in low visibility conditions, to alert nearby boats to the vessel's location and intentions. It is part of the International Regulations for Preventing Collisions at Sea (COLREGs) to enhance communication and prevent accidents on the water.