Question 50 TV03 - Towing Vessels - Western Rivers

The Correct Answer is D. **Why Option D ("a vessel engaged in diving operations") is correct:** The signal specified in the question—a vessel exhibiting a rigid replica of the International Code flag "A" (Alpha)—is the signal used to indicate that a vessel is restricted in its ability to maneuver because it is engaged in diving operations. * **Rule 27(e) of the International Regulations for Preventing Collisions at Sea (COLREGs)** states that a vessel engaged in diving operations, when it is impractical to exhibit the lights and shapes prescribed for a vessel restricted in its ability to maneuver (Rule 27(b)), shall exhibit three all-round lights in a vertical line (red, white, red) and shapes (ball, diamond, ball), **OR** a rigid replica of the International Code flag "A" (Alpha). * **Flag Alpha (Alpha flag)**, in signal code, means "I have a diver down; keep well clear at slow speed." This shape is universally recognized for diving operations under both International and Inland (US) rules. **Why the other options are incorrect:** * **A) a vessel transferring explosives:** This activity does not have a unique shape prescribed by COLREGs. Vessels handling dangerous cargo (like explosives) generally rely on standard signals (like restricted maneuvering shapes/lights if applicable) or harbor regulations, but not the Alpha flag. The Alpha flag is reserved specifically for diving. * **B) a vessel engaged in underway replenishment:** Underway replenishment is an activity that makes a vessel Restricted in its Ability to Maneuver (RAM). Such a vessel must display the appropriate shapes or lights for a RAM vessel (ball, diamond, ball shapes or red, white, red lights), as prescribed in COLREG Rule 27(b). It does not use the Alpha flag. * **C) a vessel pulling a submarine cable:** This vessel is engaged in a towing operation and, depending on the circumstances, may also be considered a vessel Restricted in its Ability to Maneuver (RAM). If it is RAM, it displays the standard RAM shapes (ball, diamond, ball). It does not use the Alpha flag, which is exclusively for diving.