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- Q171 - Navigation General: Near Coastal
61. A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below?
Choice C is correct; octagonal daymarks indicate safe water or mid-channel fairways, signifying navigable water around the mark. This shape distinguishes safe water marks from lateral (square or triangle) and regulatory/hazard (diamond) markings, as defined by U.S. aids to navigation regulations.
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