Question 15

The Correct Answer is A **Explanation for A (A seaplane):** Rule 18(d) of the International Regulations for Preventing Collisions at Sea (COLREGs) states that "A seaplane on the water shall, in general, keep clear of all vessels and avoid impeding their navigation." This clearly establishes that a seaplane has the lowest priority and must keep clear of a power-driven vessel (assuming neither is restricted in its ability to maneuver). This rule applies universally (both International and Inland, as most inland waters follow similar hierarchy principles or adopt COLREGs directly). **Explanation for why other options are incorrect:** * **B) A sailing vessel:** According to Rule 18(a)(ii), a power-driven vessel must keep out of the way of a sailing vessel, meaning the sailing vessel *should* impede the power-driven vessel's navigation (i.e., the power-driven vessel must maneuver for it). * **C) A vessel not under command:** According to Rule 18(a)(i), a power-driven vessel must keep out of the way of a vessel not under command (NUC). A vessel not under command has higher priority and should impede the power-driven vessel's navigation. * **D) A vessel engaged in fishing:** According to Rule 18(a)(iii), a power-driven vessel must keep out of the way of a vessel engaged in fishing. The fishing vessel has higher priority and should impede the power-driven vessel's navigation.