Question 45 ONC05 - Master or Mate of LT 200 GRT

The Correct Answer is B **Explanation for Option B (One prolonged blast):** According to both the International Regulations for Preventing Collisions at Sea (COLREGS Rule 34(e)) and the Inland Navigational Rules (Inland Rule 34(e)), a vessel nearing a bend or an area of a channel or fairway where other vessels may be obscured by an intervening obstruction is required to sound a specific warning signal. This signal is **one prolonged blast** (a blast lasting from four to six seconds). If a vessel hears this signal coming from the bend, it is also required to answer with one prolonged blast. This signal serves as a general warning of the vessel's approach when visual contact is not yet possible. **Explanation of Incorrect Options:** * **A) One short blast:** This signal is used under both Inland and International Rules to indicate a maneuver in sight of another vessel (e.g., "I intend to leave you on my port side" when in a meeting or crossing situation under International Rules, or an intention to pass when in a maneuvering situation under Inland Rules). It is not the prescribed signal for warning other vessels obscured by a bend. * **C) Two short blasts:** This signal is used under both Inland and International Rules to indicate a maneuver in sight of another vessel (e.g., "I intend to leave you on my starboard side" or "I intend to pass you on your starboard side"). It signifies a specific turning or passing intention, not a general warning at an obscured bend. * **D) One long blast:** While "prolonged" and "long" can seem similar, the specific regulatory term is **prolonged blast** (4 to 6 seconds). The term "long blast" (sometimes used in casual conversation) is not the official regulatory term and could be confused with distress or fog signals depending on the context. In fog situations, a power-driven vessel making way sounds one prolonged blast, further establishing the prolonged blast as the standard warning signal.