Question 1 ONC03 - Master LT 500-1600 GRT

The Correct Answer is B **Explanation for Option B ("Vessel constrained by her draft"):** Option B, "Vessel constrained by her draft," is the correct answer because this term is **not** defined or used within the scope of the Inland Navigation Rules (33 CFR Subchapter E). The concept of a "vessel constrained by her draft" exists only in the International Rules (COLREGs, Rule 3(h), and Rule 28 for signals). Inland waters, being generally shallower and often having clearly marked navigable channels, do not utilize this specific designation for determining right-of-way or displaying specialized signals. **Explanation for Options A, C, and D (Why they are incorrect):** * **A) Seaplane:** This term is defined in the Inland Rules under Rule 3(j): "The term 'seaplane' means any aircraft designed to maneuver on the water." * **C) Restricted visibility:** This term is defined in the Inland Rules under Rule 3(k): "The term 'restricted visibility' means 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 fundamental and defined in the Inland Rules under Rule 3(a): "A vessel is 'underway' when she is not at anchor, made fast to the shore, or aground."