Question 21 GLI08 - Limited OUPV

The Correct Answer is B **Explanation for B (Correct Answer):** The rule governing signals for vessels leaving a dock or berth is found in the Inland Rules, specifically Rule 34(g). This rule states: > "Whenever a **power-driven vessel** is leaving a dock or berth, she shall sound one prolonged blast." This signal is mandatory **only** for power-driven vessels and is sounded upon getting underway, regardless of visibility or the presence of other vessels. Therefore, a vessel leaving a dock or berth *must* sound a prolonged blast only if she is a power-driven vessel. **Explanation of Incorrect Options:** * **A) other vessels can be seen approaching:** The requirement to sound the prolonged blast upon leaving the berth is mandatory for power-driven vessels regardless of traffic. Traffic signals (short blasts for intentions or warning) would be used for interaction with approaching vessels, but the initial prolonged blast is required even if no other vessels are in sight. * **C) visibility is restricted:** Restricted visibility requires specific signals (Rule 35, often prolonged blasts at intervals) while underway, but the signal for leaving a dock/berth (Rule 34(g)) is required regardless of visibility conditions. If visibility is restricted, the prolonged blast required by Rule 34(g) is sounded upon departure, and then the vessel must transition immediately to the restricted visibility signals of Rule 35. * **D) her engines are going astern:** The signal for a vessel backing out of a slip or moving astern (three short blasts) is governed by Rule 34(a)(iii). This is a different signal used to indicate engine movement. Rule 34(g) specifically addresses the initial *act* of leaving the dock or berth and requires the single prolonged blast, which is mandatory for power-driven vessels regardless of whether they initially move ahead or astern.