Figure 9-13.—IALA Maritime Buoyage System lateral marks, region B.5. Special marks—call attention to an area orspecific feature. Explanation of special marks may befound on the chart or in Sailing Ditrections or CoastPilots.Distinguishing MarksThe meaning of distinguishing marks dependsupon one or more of the following features:By day—color, shape, and topmarkBy night—light color and phase characteristicsBuoy ShapeThere are five basic buoy shapes (fig. 9-14): thecan, nun, spherical, pillar, and spar. With the exceptionof the pillar and the spar buoys, the shape of the buoysindicates the correct side on which to pass. Can buoysFigure 9-14.—Types of buoys.are sometimes referred to as cylindrical buoys and nunbuoys are referred to as conical buoys. The term pillar9-14
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