Ships with a net tonnage of five tons or more that are engaged in fishing within U.S. navigable waters or the Exclusive Economic Zone (EEZ), as well as those involved in coastwise trade, are subject to documentation, unless a specific exemption applies. Coastwise trade pertains to the conveyance of goods or passengers between locations in the U.S. or the EEZ. Furthermore, towboats operating between U.S. points or within the EEZ, as well as dredges in operation within the U.S. or the EEZ, are required to undergo documentation.