US Vessel Documentation, Inc. is NOT the National Vessel Documentation Center; we are the nation's #1 rated agency that handles USCG Documentation processing to NVDC.Vessel documentation is a national form of registration. It is one of the oldest functions of Government, dating back to the 11th Act of the First Congress. Documentation provides conclusive evidence of nationality for international purposes, provides for unhindered commerce between the states, and admits vessels to certain restricted trades, such as coastwise trade and the fisheries. Since 1920, vessel financing has been enhanced through the availability of preferred mortgages on documented vessels.