Question 382Navigation General

The correct answer is A) Two green lights. According to the U.S. Coast Guard Navigation Rules, for a fixed lock and dam structure like the one depicted in Illustration D036NG, the position indicated by the letter D would exhibit two green lights to mark the entrance to the lock. This is because green lights are used to mark the main channel or entrance to the lock, guiding vessels through the waterway. The other answer choices are incorrect, as a red light would be used to mark a side or secondary channel, and no light would not conform to the standard navigational lighting requirements for this type of structure.