National Vessel Movement Center. Definition from the US Coast Guard: The National Vessel Movement Center (NVMC) was established by the United States Coast Guard (USCG), in accordance with Title 33 Part 160 of the U.S. Code of Federal Regulations, as a single clearinghouse for submission and processing of notice of arrival and departure (NOAD) information for vessels entering U.S. ports and facilities. The NVMC has functioned continuously since October 2001.