Question 333Navigation General

The correct answer is B) May show a yellow light with a flashing rhythm. Special marks under the U.S. Aids to Navigation System are used to indicate special areas or features, and they are distinguished by their yellow color. Per the regulations, special marks may show a yellow light, and this light can have a flashing rhythm, which makes option B the correct choice. The other options are incorrect because: A) special marks are not required to have a fixed or flashing white light, C) the Morse code "A" rhythm is not a characteristic of special marks, and D) special marks do not necessarily have to be lighted with a yellow isophase light.