Question 400Navigation General

The correct answer is C) ready for entrance. According to the US Coast Guard regulations, a flashing green light displayed at a single lock indicates that the lock is ready for entrance. This means that the lock is open and the vessel can safely proceed into the lock. The other answer choices are incorrect because: A) A steadily displayed green light, not a flashing one, would indicate that the lock is ready for entrance but the gates cannot be closed completely. B) A red light, not a green light, would indicate that the lock is not ready for entrance. D) A flashing light, not a steady light, would indicate that the lock is ready for entrance, not being made ready.