🔍 Key Concepts

• Rule 3 – General Definitions of the Navigation Rules, especially the definition of a vessel restricted in her ability to maneuver • The difference between restricted in ability to maneuver (RAM), constrained by draft (CBD), and not under command (NUC) • Specific activities listed in the Rules that make a vessel RAM (e.g., servicing navigation marks, dredging, under­water operations, mineclearing, flight operations)

💭 Think About

• Look at each choice and decide: is this condition specifically defined in the Rules as restricted in ability to maneuver, or does it fit better under another defined term (like constrained by draft, fishing, or not under command)? • Ask yourself which of these vessels is carrying out a special operation that, by its nature, keeps her from keeping clear of other vessels as required by the Rules. • Check whether the problem is due to the vessel’s operation (what she is doing) or due to a casualty/failure (what is broken) or simply her deep draft.

✅ Before You Answer

• Verify the exact wording of the RAM definition in Rule 3(g) of the Navigation Rules. • Check which choice matches one of the explicit examples of RAM given in the Rule (don’t rely on what “sounds” restricted). • Be sure not to confuse constrained by draft or not under command with restricted in her ability to maneuver—they are separate, defined terms.