The Economist: GPS and sport: Location, location, location
SPORT is no stranger to the global positioning system (GPS). Satellite tracking has been used for more than ten years to map ski routes over rugged terrain, compare rowing stroke rates and boat speeds. It even settled the debate about which ball sport required athletes to run the greatest distance during a match (Australian football, apparently). Two Australian companies are pushing the technology even further: to identify poor training, reveal hidden injuries and finger myopic referees.
Via The Economist
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