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A gyre in oceanography is any large system of rotating ocean currents, particularly those involved with large wind movements. Gyres are caused by the Coriolis effect; planetary vorticity along with horizontal and vertical friction, which determine the circulation patterns from the wind curl (torque).
With six plastic gyres to clean up in three oceans, we are looking at a minimum international fleet in the region of 300 ZCCs at a probable cost of $0.9 billion dollars (0.736 billion) @ $3 million dollars (2.45 million) a unit-and that is assuming mass production on a not for profit basis.