Question 5 ONC03 - Master LT 500-1600 GRT

The Correct Answer is C **Explanation for Option C (Correct Answer):** Option C, "the nature of her work," is the correct answer because it directly reflects the definition and legal status of a vessel "restricted in her ability to maneuver" (RAM) under both the International Regulations for Preventing Collisions at Sea (COLREGs), Rule 3(g) and Rule 18. A vessel becomes RAM because the tasks she is performing inherently prevent her from deviating from her course and speed. These tasks include laying or sweeping mines, dredging, surveying, submarine cable laying, replenishment at sea, etc. Under COLREGs Rule 18(b), a RAM vessel is given priority over most other classes of vessels (like power-driven, sailing, and fishing vessels) because her ability to maneuver is limited by the job she is doing. **Explanation of Incorrect Options:** * **A) her draft:** This refers to a "vessel constrained by her draft" (CBD). Although CBD vessels are also limited in maneuverability (specifically in shallow water), they are defined separately under COLREGs Rule 3(h). Their limitation is due to the relationship between their deep draft and the available depth and width of navigable water, not the *nature of their work*. * **B) some exceptional circumstances:** While exceptional circumstances could lead to a vessel becoming "not under command" (NUC) (e.g., engine failure or fire), they do not define a vessel "restricted in her ability to maneuver." A RAM vessel is *by definition* intentionally engaged in an operation that restricts movement, which is not an "exceptional circumstance" or an accident. * **D) a danger of navigation:** This term is too broad. While dangers like shoals or wrecks may force any vessel to alter course, they do not categorize a vessel as being "restricted in her ability to maneuver" as defined by the international rules. The limitation for a RAM vessel stems from her operational task, not an external, general hazard.