To obtain a COI, the owner or managing operator of the towing vessel should follow the steps outlined in 46 CFR 136.210. The local Officer in Charge, Marine Inspection may, as resources permit, issue a COI based upon an onboard inspection or a valid Uninspected Towing Vessel decal as provided in CG-CVC Policy Letter 17-01.
Source: USCG
Link: 1/16/2018: Coast Guard to start issuing COIs under Subchapter M TSMS option