Goalref uses a microchip that is actually placed inside the ball and uses magnetic waves to determine whether the ball has crossed the goal-line. Hawk-Eye, a technology already used in tennis, uses high-speed cameras and triangulation.
The pressure to approve goal-line technology has been building for several years after high-profile mistakes in the the World Cup and European Championships. The clincher may have come at the most recent European Championship when Ukraine was denied a goal against England. That prompted UEFA President Sepp Blatter to tweet out: "After last night’s match #GLT is no longer an alternative but a necessity."
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