Question 35 UFV01 - Master - Uninspected Fishing Vessels

The Correct Answer is A **Explanation for Option A (one prolonged blast):** According to the U.S. Inland Navigational Rules (Rule 34(d)), a power-driven vessel intending to leave a dock or berth is required to sound **one prolonged blast**. This signal serves as a warning or cautionary signal to any approaching vessels or vessels in the immediate vicinity, indicating the vessel is underway and potentially obstructing the channel or fairway. **Why the other options are incorrect:** * **B) four short blasts:** Four short blasts is the general signal used to indicate a vessel is not under command or is constrained by her draft (though the constrained by draft signal is technically one double flash followed by one prolonged and two short blasts under Inland rules, four short blasts is not the specified leaving-a-dock signal). It is not the signal required for leaving a dock or berth. * **C) one long blast:** While "prolonged" and "long" might sound similar, the precise regulatory term specified in the Rules is **prolonged blast**, defined as a blast of from four to six seconds duration. Using the term "long" is technically imprecise when referencing the formal rule requirement. Furthermore, this option is redundant if Option A is already present and uses the correct terminology. * **D) no signal is required:** This is incorrect. Rule 34(d) explicitly mandates the sounding of one prolonged blast in this specific scenario to warn other vessels.