Patent ID: 8007331

Claim:
A floatable structure comprising a float, the float comprising a hollow shell defining an airtight hollow interior region and defining a first major plane coinciding with a horizontal plane, which in use extends through the hollow shell at its maximum horizontal cross-sectional area, a damping means extending laterally outwardly from the hollow shell on opposite sides thereof for damping buoyant movement of the hollow shell in water in a generally vertical direction, the damping means defining a first plane extending parallel to the first major plane defined by the hollow shell, a pair of coupling means located in the damping means at respective opposite ends of the hollow shell for coupling the float to a mooring rope, a keel extending downwardly from the hollow shell for minimising rolling movement of the hollow shell, and extending between the respective coupling means, and the keel defining a corresponding keel plane extending perpendicularly to the first plane defined by the damping means, and a pillar extending upwardly from the hollow shell, the pillar being adapted so that the floatable structure is suitable for use as a navigational buoy, and the pillar terminates in a receiving means for receiving any one or more of the following: a beacon, a radar reflector, and instrumentation.