The biathletes competing for gold are the first winter Olympians to get an edge by wearing technology as they compete.
Marathon runners have already been using the same kind of wireless device during the Summer Olympics.
The edge biathletes get from the devices strapped to their ankles is faster assessment of "split times," or their time over just a small portion of the racecourse. "Splits" help coaches determine how much time athletes have to make up on their rivals, if they are behind in the race. It could mean a change in strategy that wins the gold.
Split times in biathlon races have always been done by hand at the Olympics.
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