Question 46 ONC06 - Master LT 100 GRT

The Correct Answer is D. **Explanation of why option D ("All of the above") is correct:** The fog signal consisting of one prolonged blast followed by two short blasts is mandated for specific categories of vessels that are underway, but not making way, or vessels constrained by their operation or situation. This signal serves to alert other mariners that the vessel is in a limited state or requires special consideration. According to both the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 35(e) and the corresponding Inland Rules, this signal is required for: 1. A vessel restricted in her ability to maneuver (RAM). 2. A vessel constrained by her draft (International only, but often included in general lists of restricted vessels). 3. A **sailing vessel** (Rule 35(c)). 4. A **vessel not under command** (NUC). 5. A vessel engaged in fishing or trawling. 6. A vessel engaged in towing or pushing (if exempt from the specific signals for tows). Since Option B (A sailing vessel underway) and Option C (A vessel not under command) are explicitly required to sound this signal (by Rule 35(c)), and Option A (A vessel restricted in its ability to maneuver, at anchor) is also required to sound this signal (by Rule 35(g), which dictates that a RAM vessel at anchor must sound the RAM signal *in addition* to the standard anchor signal), all three listed vessel types must sound this specific sequence under fog conditions. Therefore, "All of the above" is the correct choice. --- **Brief explanation of why each of the other options is individually incorrect (as the *only* answer):** * **A) A vessel restricted in its ability to maneuver, at anchor:** While this vessel *is* required to sound this specific signal (Rule 35(g)), it is not the *only* vessel type required to do so. The question asks which vessel(s) are required, implying the selection must cover all applicable examples provided. * **B) A sailing vessel underway:** A sailing vessel is required to sound this signal (Rule 35(c)), but it is not the *only* vessel type required to do so. * **C) A vessel not under command:** A vessel not under command is required to sound this signal (Rule 35(c)), but it is not the *only* vessel type required to do so.