Question 35 ONC02 - Second Mate/Third Mate Unlimited Tonnage

The Correct Answer is A **Why Option A ("one prolonged blast") is correct:** The U.S. Inland Navigation Rules (specifically Rule 34(d)) require a power-driven vessel leaving a dock or berth to give an audible signal. This signal is intended to notify approaching vessels of the maneuver. The required signal for this action is **one prolonged blast** (a blast lasting 4 to 6 seconds). **Why the other options are incorrect:** * **B) four short blasts:** Four short blasts is the required danger or alarm signal (Rule 34(f)) used when vessels approach each other and for any reason either vessel fails to understand the intentions or actions of the other, or is in doubt whether sufficient action is being taken to avoid collision. It is not the signal for leaving a dock. * **C) one long blast:** While a prolonged blast is often colloquially referred to as a "long blast," the official terminology in the Rules specifies "prolonged blast" (4-6 seconds). More importantly, in the context of official signals, "one prolonged blast" (which is option A) is the precise required signal for this maneuver. * **D) no signal is required:** This is incorrect. The Inland Rules explicitly mandate an audible signal (one prolonged blast) when a power-driven vessel leaves a dock or berth.