Which term is NOT defined in the Inland Navigation Rules?

• A. Vessel Not Under Command
• B. Vessel Engaged In Fishing
• C. Vessel Not Under Way
• D. Vessel Constrained By Her Draft

Answer: (A)

On inland waterways, the rules define certain vessel statuses to guide how boats should operate around each other. Among the common defined terms, “Vessel Engaged In Fishing” is a defined category, since a fishing vessel may have limited maneuverability and other vessels must take that into account. “Vessel Not Under Way” is also defined, describing a vessel that is not moving (such as one that is anchored or moored), which affects how other vessels approach or pass. “Vessel Constrained By Her Draft” is another defined status, used for vessels whose deep draft severely limits their ability to maneuver in narrow channels, affecting right-of-way considerations.

The term that is not defined in the Inland Navigation Rules is the one that comes from the international COLREGS: a vessel not under command. Although the concept exists in international rules, it is not defined as a term within the Inland Rules, which is why this is the correct choice.