Superyacht owners and designers want to avoid unattractive and cumbersome fixed or portable deadlights on hull windows and portlights. Using technology we have developed TILSE GLASS CS®, a compound system safety glazing for hull windows and portlights which meets the requirements for Lloyds classed and Cayman Islands flagged superyachts under LY3. With TILSE GLASS CS® both permanently fixed and locally stored deadlights are avoided altogether.