Question 99Navigation General

The correct answer is B) Circle. An orange and white buoy marking an area where operating restrictions are in effect will be marked with a circle symbol. This is in accordance with the United States Aids to Navigation System, which specifies that a circle symbol is used to indicate a controlled or restricted area. The other answer choices are incorrect because they represent different buoy symbols that are used for different purposes - an open-faced diamond for a special mark, a diamond with a cross for a regulatory mark, and a rectangle for an information or direction mark.