Question 1 OSV01 - Master/Chief Mate - Offshore Supply Vessels

The Correct Answer is B **Explanation of Option B ("Vessel constrained by her draft"):** Option B is the correct answer because the term "Vessel constrained by her draft" is a definition found exclusively in the **International Rules (COLREGs)** (Rule 3(l)). This definition is deliberately omitted from the U.S. Inland Navigation Rules (33 CFR Subchapter E, Part 83, Rule 3). In U.S. domestic waters, a vessel hampered by draft must operate under the category of a **"Vessel restricted in her ability to maneuver"** if the depth constraint truly restricts her movement (Inland Rule 3(g)). *** **Explanation of the other options:** * **A) Seaplane:** This term *is* defined in the Inland Rules. Inland Rule 3(n) states: "The term 'seaplane' includes any aircraft designed to maneuver on the water." * **C) Restricted visibility:** This term is a core concept and regulatory condition explicitly addressed in the Inland Rules (Rule 19 – Conduct of vessels in restricted visibility), even if it lacks a precise standalone definition in Rule 3. The Rules define the required actions and responsibilities for vessels operating in these conditions. * **D) Underway:** This term *is* defined in the Inland Rules. Inland Rule 3(i) states: "A vessel is 'underway' when she is not at anchor, made fast to the shore, or aground."