When is a vessel considered "underway"?

A vessel is considered "underway" when it is not tied to a pier or anchored. This definition is crucial for understanding navigation rules, as it signifies that the vessel is in motion or is capable of being in motion. When a vessel is underway, it is subject to various navigational rules, including those related to right of way and vessel operation.

In contrast, when a vessel is tied to a pier or docked, it is stationary and not in a position to navigate. Similarly, when a vessel is anchored, it is securely held in place and not free to move. These situations indicate that the vessel is not maneuvering through navigable waters, which is why they do not qualify as "underway." Understanding this distinction helps boaters adhere to safety regulations and makes them aware of legal responsibilities while operating their vessels.