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GH$\alpha$FaS a new Fabry-Perot system, is now available at the WilliamHerschel Telescope. It was mounted, for the first time, at the Nasmyth focus ofthe 4.2 meter WHT on La Palma in July 2007. Using modern technology, with aspectral resolution of the order R$\sim$15000, and with a seeing limitedspatial resolution, GH$\alpha$FaS will provide a new look at the H$\alpha$-emitting gas over a 4.8 arcminutes circular field in the nearby universe. Manyscience programs can be done on a 4.2 metre class telescope in world classseeing conditions with a scanning Fabry-Perot. Not only galaxies but HIIregions, planetary nebulae, supernova remnants and the diffuse interstellarmedium are subjects for which unique data can be aquired rapidly. Astronomersfrom the Laboratoire d'Astrophysique Exp\'erimentale (LAE) in Montr\'eal, theLaboratoire d'Astrophysique de Marseille (LAM-OAMP), and the Instituto deAstrof\'isica de Canarias (IAC), have inaugurated GH$\alpha$FaS by studying indetail the dynamics of some nearby spiral galaxies. A robust set ofstate-of-the-arts tools for reducing and analyzing the data cubes obtained withGH$\alpha$FaS has also been developed.

GH $\alpha$ FaS : Galaxy H-alpha Fabry-Perot System for the WHT