the carriage of
goods; or all commercial vessels (as opposed to all nonmilitary ships),
which excludes tugs, fishing vessels, offshore oil rigs, etc.; or a
grouping of merchant ships by nationality or register. This entry
contains information in two subfields - total and ships by type. Total
includes the total number of ships (1,000 GRT or over), total DWT for
those ships, and total GRT for those ships. DWT or dead weight tonnage
is the total weight of cargo, plus bunkers, stores, etc. that a ship
can carry when immersed to the appropriate load line. GRT or gross
register tonnage is a figure obtained by measuring the entire sheltered
volume of the ship available for cargo and passengers and converting it
to tons on the basis of 100 cubic feet per ton; there is no stable
relationship between GRT and DWT. Ships by type includes a listing of
barge carriers, bulk cargo ships, cargo ships, chemical tankers,
combination bulk carriers, combination ore/oil carriers, container
ships, liquefied gas tankers, livestock carriers, multifunctional
large-load carriers, petroleum tankers, passenger ships,
passenger/cargo ships, railcar carriers, refrigerated cargo ships,
roll-on/roll-off cargo ships, short-sea passenger ships, specialized
tankers, and vehicle carriers.

A captive register is a register of ships maintained by a
territory, possession, or colony primarily or exclusively for the use
of ships owned in the parent country; it is also referred to as an
offshore register, the offshore equivalent of an internal register.
Ships on a captive register will fly the same flag as the parent
country, or a local variant of it, but will be subject to the maritime
laws and taxation rules of the offshore territory. Although the nature
of a captive register makes it especially desirable for ships owned in
the parent country, just as in the internal register, the ships may
also be owned abroad. The captive register then acts as a flag of
convenience register, except that it is not the register of an
independent state.

A flag of convenience register is a national register offering
registration to a merchant ship not owned in the flag state. The major
flags of convenience (FOC) attract ships to their registers by virtue
of low fees, low or nonexistent taxation of profits, and liberal
manning requirements. True FOC registers are characterized by having
relatively few of the registered ships actually owned in the flag
state. Thus,