Question 7 FCP01 - First Class Pilot

The Correct Answer is C **Explanation for Option C (Correct):** Option C states, "You may sound at least five short and rapid blasts on the whistle." This action is the prescribed signal for conveying doubt or danger regarding the intentions or actions of another vessel, as outlined in **COLREG Rule 34(e)** (Maneuvering and Warning Signals). While the primary rule cited in the prompt is Rule 9 (Narrow Channels), the situation described—operating in a narrow channel while being uncertain of the intentions of a crossing vessel—is fundamentally a close-quarters situation where risk of collision or dangerous action exists. Rule 34(e) mandates the use of the doubt/danger signal: * **COLREG Rule 34(e):** "If necessary, a vessel may supplement the prescribed signals [blast signals] with light signals... or may use the signals prescribed in Rule 34(d)." * **COLREG Rule 34(d):** "When vessels are in sight of one another, any power-driven vessel... **shall indicate her doubt** whether sufficient action is being taken by the other vessel to avert collision by **sounding at least five short and rapid blasts** on the whistle." Since you are "in doubt as to his intentions," sounding the danger signal (five or more short blasts) is the appropriate action under the International Regulations for Preventing Collisions at Sea (COLREGs). **Explanation of Incorrect Options:** * **A) You must sound one prolonged and two short blasts:** This signal is defined in **Rule 34(c)** (International only) and is used by vessels approaching a bend or area of obscured visibility. It signals approach, not doubt or danger regarding a vessel already in sight and crossing. * **B) You should sound one short blast to indicate that you are holding course and speed:** In the International Rules (COLREGs), blast signals (one, two, or three short blasts) indicate *actions* (I am altering course to starboard, I am altering course to port, I am operating astern propulsion), not intentions or a declaration of holding course. If you are in doubt, holding course and simply sounding one short blast would be inappropriate and potentially dangerous, as the signal itself implies an alteration of course (to starboard), which you are not undertaking. * **D) You are required to back down:** While taking evasive action, including backing down (using astern propulsion), might eventually become necessary under Rule 8 (Action to Avoid Collision) or Rule 17 (Action by Stand-on Vessel), the immediate requirement when you are "in doubt as to his intentions" is to signal that doubt. Maneuvering action (like backing down) is generally only required after the danger signal has been sounded and/or if collision cannot be avoided by the other vessel’s actions alone. The immediate requirement is signaling doubt.