Navigation and Seamanship

4.3.7. Light ships

              

              Light ships are established to serve the same purpose as light house, being equipped with lights, fog signals and used only when it is impossible to construct a light house at the desired position. Light ships mark the entrances to harbours or estuaries, dangerous shoals lying in much frequented waters. Maintenance cost is very high for Light ships when compare to light house. Light ship is a specially designed vessel, anchored in a precisely determined position, equipped with a high intensity light of specified characteristics and usually with other supporting aids to navigation as well. Now these light ships an replaced by large navigational buoys, due to high maintenance cost.