What does the term "underway" indicate for a vessel?

The term "underway" refers to a vessel that is not anchored, tied to shore, or aground. This means that the vessel is actively moving through the water or is able to move.

Being "underway" is a key concept in navigation and maritime law, as it affects numerous rules and regulations that apply to the operation of vessels. For instance, vessels that are underway have specific obligations regarding navigation lights, sound signals, and right-of-way rules to avoid collisions. Understanding this terminology is crucial for boaters, as it influences safety and compliance on the water.

The other options describe conditions where a vessel is not able to navigate freely, such as being at anchor or docked, which would not qualify as "underway."