Section R. 281.1105 - Markers; size, shape, material, and constructionRule 5.
(1) The size, shape, material, and construction of all markers, both fixed and floating, shall be such as to be observable under normal conditions of visibility at a distance whereby the significance of the marker or aid will be recognizable before the observer proceeds into danger.(2) All buoys, except mooring buoys and fish net or other fishing device buoys, shall be not less than 6 inches in diameter and shall have an exposure of not less than 36 inches extending above the water line of the buoy.(3) Mooring buoys shall be not less than 12 inches in diameter and shall have an exposure of not less than 18 inches extending above the water line of the buoy.(4) Buoys of dimensions other than specified by these rules may be authorized by the director or his authorized representative to meet unusual conditions.(5) All buoys shall be ballasted so that they will float upright without assistance from the anchor or anchor line.Mich. Admin. Code R. 281.1105