Question 868 Rules of the Road

The correct answer is A) a vessel engaged in diving operations. Vessels engaged in diving operations are required to exhibit a rigid replica of the International Code flag "A" (the "alpha" flag) both internationally and under inland navigation rules. This is to signal that the vessel has a diver or divers in the water, and other vessels should keep clear and operate at a safe speed to avoid endangering the diving operation. The other options (B, C, and D) do not require the display of the "alpha" flag. Vessels engaged in underway replenishment, transferring explosives, or pulling a submarine cable have different signaling requirements to indicate their activities.