46 U.S.C. § 53901 — Definitions

a documented vessel^* with a registry or coastwise endorsement under chapter 121 of this title;

an undocumented^* vessel owned or chartered by or made available to the United States Government; and

a tug, barge^*, or other watercraft (whether or not documented) owned by a citizen of the United States and used in essential water transportation or in the fisheries^*, except only for sport fishing.

any part of a loss excluded from marine insurance coverage under a “free of capture or seizure” clause or analogous clause; and

any other loss from a hostile act, including confiscation, expropriation, nationalization, or deprivation.