What defines a "sail" vessel under navigation regulations?

A vessel is defined as a "sail" vessel when it is reliant on the wind for movement. This definition highlights the primary characteristic of sailboats, which utilize sails to capture wind energy, converting it into forward motion. The design and rigging of these vessels are specifically tailored to harness wind effectively, allowing them to navigate through water primarily by this natural force.

Other types of propulsion are not considered under the definition of a "sail" vessel. For instance, vessels that use oars for propulsion rely entirely on human effort and do not utilize wind, ruling them out of this specific classification. Similarly, motor-powered vessels depend on engines for movement, which is distinctly contrary to the concept of sailing. Lastly, vessels that operate under human power only, such as canoes or kayaks, do not utilize sails and therefore do not fall into the definition of a "sail" vessel as related to navigation regulations.