What technology is used? NFL NextGen stats puts some sensors in the equipment, but there’s no way that Olympic swimmers or track athletes are wearing any sensors.
In: Technology
You don’t really need any special equipment when you precisely know the distance to be travelled and the length of the track/pool to some arbitrary precision deemed good enough. A stopwatch and math can do it in real time and a high speed camera with a synchronized timer can be used to verify any records when you need it exact.
It’s almost exactly fifth grade math, actually. Speed equals distance divided by time, like those two people each get on a train questions from grade school.
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