What does it mean to be "underway"?

Being "underway" in maritime terminology means that a vessel is in motion and not securely tied to the dock, anchored, or moored. This concept is crucial for understanding navigational responsibilities and regulations. When a vessel is underway, it is capable of maneuvering in the water, which carries specific legal implications under maritime law regarding the vessel's navigation and right-of-way.

In contrast, being docked at a marina or anchored in place means the vessel is stationary and secured, while being moored alongside another vessel indicates that it is fastened in a particular location, either to a pier or other vessels. Only when a vessel is actively moving through the water is it considered to be underway, emphasizing the need for vigilance and adherence to navigation rules. This understanding is essential for anyone operating or managing a vessel, as it affects everything from safety operations to regulatory compliance.