Subchapter “M” goes into effect on​ July 20, 2018​. This is when your vessel needs to be  in “compliance”. HOWEVER, the issuance of a Certificate of Inspection (COI) is based on how  many vessels, subject to Subchapter M, that the company operates. ​Maritime Safety  Management Services ​will assist you in that process of obtaining a COI and understanding  what you need to do in order to be in “compliance” before they Coast Guard comes to inspect  your vessel.