Question 7 GLI01 - Master-Unlimited Tonnage

The Correct Answer is C **Why option C is correct:** The scenario describes operating in a narrow channel (Rule 9 applies) where another vessel is crossing your course (a potential collision situation, or at least one causing doubt) and you are in **doubt as to his intentions**. The International Regulations for Preventing Collisions at Sea (COLREGs), specifically **Rule 34(d)** (Maneuvering and Warning Signals), dictates the required action when a vessel is in doubt about the intentions or actions of another vessel, or whether sufficient action is being taken by the other vessel to avoid collision. In this specific situation of doubt, Rule 34(d) permits (i.e., "may sound") the vessel to indicate this doubt immediately by sounding **at least five short and rapid blasts** on the whistle. This is the internationally recognized signal for a danger or doubt signal. (Note: Although the question emphasizes Rule 9 (Narrow Channels), Rule 9 itself primarily deals with movement *within* the channel, not signals for doubt. The correct signal for doubt is found in Rule 34(d), which applies universally.) **Why the other options are incorrect:** * **A) You must sound one prolonged and two short blasts:** This signal (one prolonged and two short blasts) is the international signal prescribed by Rule 35(e) for a power-driven vessel **at anchor** to give warning of its position at intervals of not more than two minutes. It has nothing to do with warning a crossing vessel or signaling doubt while underway. * **B) You should sound one short blast to indicate that you are holding course and speed:** Under the International Rules, one short blast indicates "I am altering my course to starboard." It does *not* indicate "holding course and speed." Furthermore, since the operator is in doubt, sounding a maneuvering signal indicating a specific alteration or intent is inappropriate until the doubt is resolved or action is committed. * **D) You are required to back down:** While taking early and substantial action is required to avoid collision (Rule 8), being in doubt does not automatically require you to reverse engines ("back down"). Reversing engines is a maneuvering action. The immediate requirement when in doubt is to signal that doubt (five short blasts), assess the situation, and then take appropriate maneuvering action (which might include backing down, but is not the *required* immediate action based solely on being in doubt).