Question 20 GLI03 - Master-LT 500-1600 GRT

The Correct Answer is D **Explanation for D (not impede the passage of vessel "B"):** This scenario involves a vessel engaged in fishing ("A") and a power-driven vessel constrained by draft (a tanker, "B") navigating a narrow channel. 1. **Rule 9 (Narrow Channels):** Rule 9(b) states that a vessel of less than 20 meters, a sailing vessel, or a vessel engaged in fishing shall not impede the passage of a vessel which can safely navigate only within a narrow channel or fairway. A large tanker in a narrow channel is likely constrained by draft and certainly restricted by the channel itself. 2. **Vessel B's Signal:** Vessel "B" sounding five short and rapid blasts is the danger or doubt signal (Rule 34(d)). This signal indicates that Vessel "B" doubts whether sufficient action is being taken by Vessel "A" to avoid immediate danger, or doubts Vessel "A"'s intentions. In this context, Vessel "B" is signaling to Vessel "A" that Vessel "A" is impeding its safe passage. 3. **Action Required:** Given Rule 9(b), Vessel "A" (fishing vessel) has a legal obligation not to impede Vessel "B"'s passage. Upon hearing the danger signal, Vessel "A" must immediately take appropriate action (such as moving out of the way, stopping, or slowing down) to ensure Vessel "B"'s passage is not impeded. Therefore, the required action is to **not impede the passage of vessel "B"**. **Explanation of Incorrect Options:** * **A) maintain course and speed:** This is incorrect. Maintaining course and speed directly contradicts the obligation under Rule 9(b) not to impede the passage of a vessel that can safely navigate only within the narrow channel. Furthermore, ignoring the five-blast danger signal would be a serious violation of good seamanship and the Rules. * **B) not answer the whistle signals from vessel "B":** This is incorrect. While five blasts is not a formal maneuvering signal requiring a specific answer (like one or two short blasts), ignoring a danger signal is dangerous and prohibited by the Rules. The proper response to the five-blast signal is to take corrective action (D) immediately, not simply ignore the warning. * **C) sound one prolonged followed by two short blasts:** This signal (Rule 35(c)) is the required signal for a vessel engaged in fishing while making way through the water in reduced visibility (fog). It is irrelevant and inappropriate for signaling intentions or danger in a narrow channel encounter in clear visibility.