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Isolated  Danger  Marks
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C69.225 Yellow is the color used for special marks. The shape of a special mark is optional, but it must not conflict with a lateral or a safe water mark. For example, an outfall buoy on the port-hand side of a channel could be can shaped but not conical. When a topmark is carried, it takes the form of a single yellow X. When a light is exhibited, it is yellow. The phase characteristics may be any, other than those used for the white lights of cardinal, isolated danger, and safe  water  marks. Daymarks Unlighted aids to navigation (except unlighted buoys) are called daymarks (fig. 5-33). A daymark may consist of a single piling with a mark on top, a spar supporting a cask, a slate or masonry tower, or any of several  structures. Daymarks, like lighthouses, are usually colored to distinguish  them  from  their  surroundings  and  make them easy to identify. Daymarks marking channels are colored and numbered like channel buoys. Many are fitted with reflectors that show the same colors that a lighted buoy would show at night in the same position. Intracoastal   Waterway The  Intracoastal  Waterway,  called  the  inland waterway, is a channel in which a light-draft vessel can navigate  coastwise  from  the  Chesapeake  Bay  almost  to the Mexican border, remaining inside the natural or artificial  breakwaters  for  almost  the  entire  length  of  the trip. Every buoy, daymark, or light structure along the Intracoastal Waterway has part of its surface painted When steering on a range, it is highly important that you ascertain the limit beyond which the range line of 5-35 Figure 5-32.— IALA Maritime Buoyage System special marks. yellow,  the  distinctive  coloring  adopted  for  this waterway. Somewhere on a lighted buoy is a band or a border of yellow. Red buoys and daymarks are to the right, green to the left, as you proceed from the Chesapeake Bay toward Mexico. As in other channels, red buoys have even  numbers;  green  buoys,  odd  numbers.  Because  the numbers would increase excessively in such a long line of  buoys,  they  are  numbered  in  groups  that  usually contain no more than 200 buoys. At certain natural dividing  points,  numbering  begins  again  at  1. Lights on buoys in the Intracoastal Waterway follow the standard system of red lights on red buoys and green lights on green buoys. Lights on other lighted aids agree with the standard rules for lights on aids to navigation. Ranges Two day beacons, located some distance apart on a specific true bearing, constitute a day beacon range. When a ship reaches a position where the two lights (or beacons) are seen exactly in line, it is “on the range.” Ranges are especially valuable for guiding ships along the approaches to or through narrow channels. Much of the  steering  through  the  Panama  Canal  is  accomplished on  ranges.  Other  examples  of  successive  straight reaches marked by ranges are the channel entrances to the St. Johns River (on the Atlantic coast) and the Columbia  River  (on  the  Pacific  coast). Lights on ranges may show any of the four standard colors, and they may be fixed, flashing, or occulting. Most range lights appear to lose intensity rapidly as a ship diverges from the range line of bearing.

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