A. In this chapter, the following terms have the meanings indicated.
B. Terms Defined.
(1) "Aground" means a vessel that is touching the bottom and unable to move.
(2) "Underway" means a vessel that is not aground, at anchor, or tied to shore.
(3) "Upper Potomac River" means that portion of the Potomac River and its tributaries above the Maryland/District of Columbia boundary near Little Falls.