Question 35

The Correct Answer is A **Explanation for A (one prolonged blast):** The Inland Navigation Rules (Rule 34(d)) specifically address the signal required for a power-driven vessel leaving a dock or berth. This rule states that a vessel leaving a dock or berth shall sound **one prolonged blast**. This signal is intended to notify other vessels in the area of the maneuver and to alert them that the vessel is underway and maneuvering into the channel. **Explanation for Incorrect Options:** * **B) four short blasts:** A sequence of four or more short blasts is generally defined as a danger or uncertainty signal (Rule 34(d)) or a requirement for a specific maneuver like operating astern propulsion, but it is not the prescribed signal for leaving a dock or berth. * **C) one long blast:** While the term "long blast" is often used colloquially, the official terminology in the Rules for this specific maneuver is **"prolonged blast"** (defined as 4 to 6 seconds). In the context of the official Rules, using "prolonged blast" (Option A) is the precise and correct answer. * **D) no signal is required:** This is incorrect. Rule 34(d) mandates that a power-driven vessel leaving a dock or berth must sound the prescribed signal (one prolonged blast) to notify other vessels.