Flag of Convenience Register (FOC)
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 register by virtue of low fees, low or nonexistent taxation of profits, and liberal manning requirements.
True FOC registers are characterised by having relatively few of the ships registered actually owned in the flag state. Thus, while virtually any flag can be used for ships under a given set of circumstances, an FOC register is one where the majority of the merchant fleet is owned abroad.
It is also referred to as an open register.