Question 1 MODU01 - Offshore Installation Manager

The Correct Answer is B ### Explanation for Option B ("Vessel constrained by her draft") Option B is the correct answer because the term "Vessel constrained by her draft" is **not** defined in the Inland Navigation Rules (33 CFR Subchapter E). This term is defined in the International Rules (COLREGs Rule 3(l)) to describe a deep-draft vessel that, due to its depth in relation to the available depth and width of the navigable water, is severely restricted in its ability to deviate from its course. The U.S. Inland Rules intentionally omit this definition and the related maneuvering exemptions, as inland waterways generally do not accommodate the extremely deep-draft vessels that this rule is designed for. Therefore, inland vessels are primarily governed by Rules 9 (Narrow Channels) and 18 (Responsibilities between vessels). ### Explanation for the Other Options * **A) Seaplane:** This term is defined in the Inland Rules (Rule 3(g)) as "any aircraft designed to maneuver on the water." * **C) Restricted visibility:** This term is defined in the Inland Rules (Rule 3(h)) as "any condition in which visibility is restricted by fog, mist, falling snow, heavy rainstorms, sandstorms, or any other similar causes." * **D) Underway:** This term is defined in the Inland Rules (Rule 3(j)). A vessel is considered "underway" when it is not at anchor, made fast to the shore, or aground.