Question 35 ONC01 - Master/Chief Mate Unlimited Tonnage

The Correct Answer is A **Explanation for A (one prolonged blast):** The Inland Navigation Rules (Rule 34(d)) specifically address the requirement for a power-driven vessel leaving a dock or berth. This rule states that a vessel leaving a dock or berth must sound **one prolonged blast**. This sound serves as an advance warning to any approaching vessels that the vessel is underway and potentially obstructing the channel or fairways. **Explanation for Incorrect Options:** * **B) four short blasts:** Four short blasts is not a prescribed signal for leaving a dock or berth under the Inland Rules. A series of short blasts (five or more) is typically used as a danger or doubt signal (Rule 34(e)). * **C) one long blast:** While the required signal is often referred to informally as a "long blast," the precise terminology used in the Inland Rules (and the international rules) is **"prolonged blast"** (a blast lasting from four to six seconds). Therefore, while the meaning is similar, "prolonged blast" (Option A) is the most accurate and legally defined term for this maneuver. * **D) no signal is required:** This is incorrect. Rule 34(d) mandates that a power-driven vessel leaving a dock or berth must sound a specific warning signal (one prolonged blast).