Question 35

The Correct Answer is A **Why Option A ("one prolonged blast") is correct:** The U.S. Inland Rules of Navigation, specifically Rule 34(g), addresses vessels leaving a dock or berth. This rule requires a power-driven vessel that is leaving a dock or berth to sound **one prolonged blast**. This serves as a warning signal to any approaching vessels that the maneuver is occurring and that the maneuvering vessel may be restricted in its ability to avoid a collision. **Why the other options are incorrect:** * **B) four short blasts:** Four short blasts is the sound signal for a vessel "in doubt" or the danger signal in International Rules (five or more short blasts). It is not the signal required for leaving a dock or berth. * **C) one long blast:** While "prolonged blast" and "long blast" are sometimes used interchangeably in casual language, the Rules define a **prolonged blast** as a blast of four to six seconds duration (Rule 32). The term "long blast" is not the official term used in the Inland Rules for this specific maneuver, though the duration is essentially the same. However, to maintain precision and adhere to the official terminology (which uses "prolonged blast"), A is the most accurate choice. * **D) no signal is required:** A signal is explicitly required by Inland Rule 34(g) to warn other vessels of the maneuvering vessel's intentions and limited visibility or maneuverability when leaving a dock or berth.