Using magnetic fields around the goal, GoalRef is one of two systems approved by the International Football Association Board (IFAB) in the quest to tackle goal-line technology.
Details about the decision to approve GLT:
http://www.fifa.com/aboutfifa/organisation/marketing/qualityprogramme/news/newsid=1659741/index.html
More about how Hawk-Eye works:
http://www.youtube.com/watch?v=exEHTO-YnuE
The important need to have quality-assurance in GLT:
http://www.youtube.com/watch?v=YADfy1SuNHE
How the GLT systems were tested:
http://www.youtube.com/watch?v=u-bSsv3Z-3E
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