Which signal indicates that a sailing vessel is underway?

The signal that indicates a sailing vessel is underway is one prolonged blast followed by two short blasts. This combination of sounds is specifically recognized in the maritime rules as a way for vessels to communicate their status. A prolonged blast generally indicates that the vessel is leaving or is under way, while the two short blasts denote the type of vessel or the intention to operate in a certain way.

In maritime navigation, clear communication through sound signals is crucial for safety and to avoid collisions. This specific sequence of blasts is part of an internationally recognized system to indicate a sailing vessel's status, ensuring that other vessels in the vicinity understand that the sailing vessel is active and might be maneuvering under sail.

Other signals, like two prolonged blasts or five short blasts, serve different purposes. For example, two prolonged blasts typically indicate a vessel that is at anchor, while five short, rapid blasts are often recognized as a warning signal to indicate that a vessel is unsure of another’s intentions or is in distress. Each signal has its own specific meaning to promote clarity in communication on the water.