Question 50 RVR02 - Master of LT 500-1600 GRT

The Correct Answer is D. **Why Option D ("a vessel engaged in diving operations") is correct:** The flag described in the question—a rigid replica of the International Code flag "A" (Alpha)—is the internationally recognized signal required by both the International Regulations for Preventing Collisions at Sea (COLREGs, Rule 27(e)) and national inland regulations (like the U.S. Inland Rules). Flag Alpha, when displayed rigidly (meaning it is displayed in a manner that ensures it maintains its shape, even without wind, typically by being mounted on a staff or frame), signifies: **"I have a diver down; keep well clear at slow speed."** This signal is specifically designated for vessels restricted in their ability to maneuver due to diving operations. **Why the other options are incorrect:** * **A) a vessel transferring explosives:** While a vessel transferring dangerous goods may be required to display certain signals (e.g., specific flags or lights), the rigid International Code Flag "A" is not the designated signal for the transfer of explosives. * **B) a vessel engaged in underway replenishment:** A vessel engaged in underway replenishment (a vessel restricted in its ability to maneuver) would display lights and shapes corresponding to a vessel restricted in its ability to maneuver (Rule 27(b)), typically ball-diamond-ball vertically, but not the rigid International Code Flag "A." * **C) a vessel pulling a submarine cable:** A vessel engaged in submarine cable operations is a vessel restricted in its ability to maneuver and would display the ball-diamond-ball signal. There is no requirement for it to specifically display the rigid International Code Flag "A" unless it also has divers in the water.