Introduction The IUT Navigation Buoy, INB-1750 , is manufactured from UV stabilized virgin polyethylene and has been specifically designed to withstand the harsh marine environments. Significant advantages of the polyethylene buoy allow the interval between servicing to be greater and users continually report major cost saving. Float Section The Float section of the INB-11so is built from a rotationaly moulded body, with UV stabilized virgin polyethylene and has a 1s-1s mm thickness. In addition the shell is filled with closed-cell polyethylene foam.