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the legend on the chart will describe ever detail. check there for the specifics for your chart. Usually for lights and or other extra detail are in parenthesis that might tell you their flash codes.... ie: Fl (1+4+3) for Minots...with other info such as the height and how far it can be seen...not usually in parenthises...
as well as the aforementoned warnings for rocks and such...
but definately check out the legend on the chart you are referring to...
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