Abstract: A floatation marker is provided for locating and identifying an anchor line. A float provides an interior surface formed as a frustum of a cone. The surface defines a central hole in the float. Preferably, the float provides for a sloped exterior surface so that, with the marker floating in water, the exterior surface is visible from an elevated position. Preferably the float is shaped as a modified torus. A passageway for the anchor line from outside of the float into the central hole of the float is provided so that the anchor line passes through the central hole. A passage block blocks the passage such that the anchor line cannot be passed back through the passage. The passage block may be a sleeve formed so as to fit loosely and slidably around the float so that in one position on the float the sleeve blocks the passage, while in another position on the float the sleeve does not block the passage.