The route display back buoy according to the present invention is a buoyancy body having a floating force at sea by the foam-molded buoy, and an isobu tower equipped with an illuminator on the upper end side provided on the upper side of the buoyancy body, and a lower portion of the buoyancy body. A lower frame installed at the side and having a balance member installed at an end side, an anchor unit installed at an end of the lower frame to support a back buoy to prevent flow, and a lower side of the buoyancy body mounted on the sofa It is provided with a sofa unit for making.
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