International classification society RINA will be developing a voluntary notation which will apply to vessels for which efforts have been made to mitigate underwater noise. The notation will only be granted to vessels which comply fully with both sets of regulations.
IMO has recently published MEPC Circ. 833 Guidelines for the reduction of underwater noise from commercial shipping to address adverse Impacts on Marine Life which sets out advice on design and operational solutions that may be adopted to reduce underwater radiated noise.
RINA has combined these standards into the DOLPHIN notation, which will be applicable from 1 July 2014. It has been developed in response to demand from clients who operate in sensitive marine areas and who wish to demonstrate that they have acted to mitigate the impact of their vessels.