Question 7

The Correct Answer is C **Explanation for C (Correct Option):** Option C states, "You may sound at least five short and rapid blasts on the whistle." This action is governed by **Rule 34(d)** (Maneuvering and Warning Signals) of the **International Regulations for Preventing Collisions at Sea (COLREGs)**, which applies universally, even when specific maneuvering is dictated by Rule 9 (Narrow Channels). Rule 34(d) covers the "doubt signal" or "danger signal." When two vessels are approaching each other and one vessel is in doubt as to the intention or action of the other vessel, or is concerned that insufficient action is being taken to avoid collision, that vessel **shall** sound at least five short and rapid blasts on the whistle. While the scenario is set in a narrow channel (Rule 9 context), the immediate doubt regarding the crossing vessel's intentions triggers the requirement for the danger signal (Rule 34(d)). **Explanation for Incorrect Options:** * **A) You must sound one prolonged and two short blasts:** This signal (one prolonged and two short blasts) is defined in Rule 35(e) as the sound signal for a vessel **not under command** or a **vessel restricted in her ability to maneuver** (RAM) while making way through the water (or Rule 35(d) for RAM stopped). It is a vessel status signal, not a narrow channel maneuvering signal or a signal for doubt regarding intent. * **B) You should sound one short blast to indicate that you are holding course and speed:** Under COLREGs Rule 34(a)(i), a single short blast indicates, "I am altering my course to starboard." Sound signals are only used to indicate an action being taken. There is no COLREGs signal to indicate simply "holding course and speed." Furthermore, since the question states you are in doubt, Rule 34(d) requires the danger signal, making any maneuvering signal inappropriate until the doubt is resolved. * **D) You are required to back down:** While backing down (using engines astern) may be necessary as part of collision avoidance, COLREGs does not *require* a vessel simply in doubt to back down. Rule 8 (Action to Avoid Collision) requires taking action in ample time, which may include backing down, but the immediate action required for expressing doubt is sounding the danger signal (Rule 34(d)), not a specific mandatory engine maneuver.