🔍 Key Concepts

• Rule 3 – General Definitions in the Navigation Rules • The meaning of vessel not under command, constrained by her draft, and restricted in her ability to maneuver • What kinds of operations make a vessel unable to keep out of the way of other vessels

💭 Think About

• Look up how the Rules define each of the four options and ask: which one is tied to a type of work or operation the vessel is doing, rather than to weather, draft, or a special situation? • Consider whether a vessel transferring cargo while underway can still maneuver normally, or whether that work significantly limits her ability to change course and speed. • Decide which category in Rule 3 specifically mentions vessels engaged in operations such as dredging, servicing navigation marks, or similar tasks.

✅ Before You Answer

• Verify the exact wording of Rule 3 – General Definitions for each vessel type listed in the answer choices. • Make sure you distinguish between ‘not under command’ (loss of ability to maneuver) and ‘restricted in her ability to maneuver’ (ability is limited by the nature of the work). • Confirm whether ‘constrained by her draft’ applies in both International & Inland Rules, or if it is limited to one set of Rules.