1 The Sub-Committee on Bulk Liquids and Gases,
                           at its thirteenth session (2 to 6 March 2009), recognized the necessity
                           of definitions for the cost effective formula to calculate the cost
                           of the approved method for existing engines in regulation 13.7.5 of
                           the revised MARPOL Annex VI and developed a circular to address the
                           issue.
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           2 The Marine Environment Protection Committee,
                           at its fifty-ninth session (13 to 17 July 2009), approved the definition
                           for the cost effective formula developed by the BLG Sub-Committee
                           at its thirteenth session.
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           3 Member Governments are invited to bring this
                           circular to the attention of their Administrations, relevant shipping
                           organizations, recognized organizations, shipping companies and other
                           stakeholders concerned and encourage them to take it into account
                           when applying the cost effective formula for the certification of
                           an approved method for existing engines.