Question 46 ONC04 - Mate of LT 500-1600 GRT

The Correct Answer is D The required fog signal of **one prolonged blast followed by two short blasts** is specifically designated for vessels that are considered "handicapped" or less maneuverable than power-driven vessels when underway, and for certain vessels at anchor that are restricted in their ability to maneuver. According to the International Regulations for Preventing Collisions at Sea (COLREGs) Rule 35(c), and the equivalent Inland Rules, the following vessels (when underway) are required to sound the signal of one prolonged blast followed by two short blasts at intervals of not more than two minutes: * A vessel **not under command** (Option C). * A vessel **restricted in its ability to maneuver** (RAM). * A vessel constrained by its draft (International only). * A **sailing vessel** (Option B). * A fishing vessel. * A towing or pushing vessel (when the tow signal is not applicable). Additionally, Rule 35(e) specifies that a **vessel restricted in its ability to maneuver, at anchor** (Option A) is also required to sound this signal (instead of the standard rapid ringing of the bell/gong for an anchored vessel). Since the signal applies to a sailing vessel underway (B), a vessel not under command (C), and a vessel restricted in its ability to maneuver, at anchor (A), **All of the above (D)** is the correct choice. --- **Explanation of why other options are incorrect (as standalone answers):** * **A) A vessel restricted in its ability to maneuver, at anchor:** This option is *correct* because this vessel must sound the one prolonged plus two short blast signal (Rule 35(e)). However, it is not the *only* vessel required to sound this signal, making it an incomplete answer when D is available. * **B) A sailing vessel underway:** This option is *correct* because a sailing vessel must sound the one prolonged plus two short blast signal (Rule 35(c)). However, it is not the *only* vessel required to sound this signal, making it an incomplete answer when D is available. * **C) A vessel not under command:** This option is *correct* because a vessel not under command must sound the one prolonged plus two short blast signal (Rule 35(c)). However, it is not the *only* vessel required to sound this signal, making it an incomplete answer when D is available.