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It indicates an underwater obstruction. Do not pass between that buoy and the shore.
Obstruction to navigation; do not pass between marker and shore. On inland waterways, a white marker or buoy with black vertical stripes indicates an obstruction. Do not pass between the obstruction marker and the shore.
http://www.boat-ed.com/ma/handbook/markers.htmInland Waters Obstruction Markers are white with black vertical stripes and indicate an obstruction to navigation. You should not pass between these buoys and the nearest shore.
Black vertical lines
If you see a white marker with black vertical stripes it means that you should not pass between the marker and the shore.In boating, a buoy consisting of a white marker with black vertical stripes indicates an obstruction to navigation. Passing between such markers and the shore is unsafe.Inland Waters Obstruction Markersare white with black vertical stripes and indicate an obstruction to navigation.You should not pass between these buoys and the shore.Shoreward obstruction marker bouy. Means don't navigate between this bouy and the shore due to underwater obstruction(s).
brown
If you see a white marker with black vertical stripes it means that you should not pass between the marker and the shore.In boating, a buoy consisting of a white marker with black vertical stripes indicates an obstruction to navigation. Passing between such markers and the shore is unsafe.Inland Waters Obstruction Markersare white with black vertical stripes and indicate an obstruction to navigation.You should not pass between these buoys and the shore.Shoreward obstruction marker bouy. Means don't navigate between this bouy and the shore due to underwater obstruction(s).
white with black vertical stripes
White and Black With Verticle Stripes
white with black vertical stripes
white with black vertical stripes
You are boating near shore at twilight. You see a square-shaped daymark. You cannot make out the marker's color. What color is it?