Board a luxury yacht made by the Ferretti Group, and you can leave the Dramamine at home. Starting in late 2004, Ferretti began offering yachts with an Anti Rolling Gyro (ARG) invented by Mitsubishi Heavy Industries. The ARG helps boats stay upright even in heavy swells simply by doing what gyros do: resisting rotation, in this case caused by waves rolling the boat. A motor sets in motion a several-hundred-pound flywheel mounted in the center of the boat. Unlike other anti-rolling devices, such as fin stabilizers, which work only when water is moving over them, the ARG works while at anchor.