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Signalman 1 & C - Historic Naval Ships Association

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landmasses given in Sailing Directions, and, ifnecessary, indicated on charts by a symbolCARDINAL MARKSA cardinal mark is used in conjunction with thecompass to indicate the best navigable water. It isplaced in one of four quadrants (north, east, south, orwest) from the best water. A cardinal mark takes itsname from the compass point in which it is placed.Figure 9-15 shows the IALA Maritime BuoyageSystem cardinal marks.The mariner is safe if he/she passes north of anorth mark, east of a east mark, south of a south mark,and west of a west mark. A cardinal mark may be usedto do the following:Indicate that the deepest water is an area on thenamed side of the mark.Indicate the safe side on which to pass a danger.Draw attention to a feature in a channel, such asa bend, junction, branch, or end of a shoal.Figure 9-15.—IALA Maritime Buoyage System cardinal marks.9-16

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