What do these dayshapes mean? A few of them may be displayed occasionally by recreational vessels, but if you operate where there are commercial vessels you’ll see dayshapes more frequently. You need to know what they mean. See the Mariner’s Guide p. 129 or the Navigation Rules 24 through 30. The text of the rules is available at www.navcen.uscg.gov/?pageName=navRulesContent
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