Question 34 RVR04 - Master or Mate of LT 200 GRT

The Correct Answer is C **Explanation of Option C (Correct):** Option C is correct because it aligns directly with Rule 34(e) of the International Regulations for Preventing Collisions at Sea (COLREGs), which applies to both international and inland waters where COLREGs are enforced. Rule 34(e) states: "A vessel nearing a bend or an area of a channel or fairway where other vessels may be obscured by an intervening obstruction shall sound one prolonged blast." A prolonged blast is defined in Rule 32(b) as a blast of approximately 4 to 6 seconds duration. This signal warns any unseen vessel on the other side of the bend of your approach. **Explanation of Option A (Incorrect):** Staying in the middle of the channel (or centerline) is generally good practice in channels, but it is not the **required action** for announcing your presence when visibility is obscured by a bend. Furthermore, in many channels, vessels are required to keep to the starboard side of the channel, making the middle an inappropriate or potentially dangerous position, depending on the rules of that specific waterway. **Explanation of Option B (Incorrect):** While navigating with caution is always required (Rule 5 – Lookout and Rule 6 – Safe Speed), stopping engines is not the required signal or mandatory maneuver when approaching an obscured bend. The primary requirement is to signal your presence (Option C). Stopping engines could lead to loss of steerage and control, potentially increasing danger. **Explanation of Option D (Incorrect):** Passing signals (short blasts indicating intentions like "I intend to leave you on my port side") are used when vessels are in sight of one another and preparing to execute a passing maneuver. When a vessel is obscured by a bend, the primary requirement is the prolonged blast (warning signal), not a passing signal indicating an immediate maneuver. Passing signals are typically inappropriate until the vessels are in sight and assessing the meeting situation.