Question 1 ONC02 - Second Mate/Third Mate Unlimited Tonnage

The Correct Answer is B **Explanation for Option B (Vessel constrained by her draft):** The term "vessel constrained by her draft" is explicitly defined and used only in the International Rules (COLREGs), specifically in Rule 3(l) and Rule 18(d). This term is **not** defined or used anywhere in the U.S. Inland Navigation Rules (33 CFR Subchapter E). Therefore, for "INLAND ONLY" operation, this term is not defined. **Explanation for Other Options (Why they are incorrect):** * **A) Seaplane:** This term *is* defined in the Inland Rules (Rule 3(m)). It states that a "seaplane" includes any aircraft designed to maneuver on the water. * **C) Restricted visibility:** This term *is* defined in the Inland Rules (Rule 3(l)). It means any condition in which visibility is restricted by fog, mist, falling snow, heavy rainstorms, sandstorms, or any other similar cause. * **D) Underway:** This term *is* defined in the Inland Rules (Rule 3(j)). It means that a vessel is not at anchor, made fast to the shore, or aground.