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If you are interested in improved speed & distance tracking, take a look at this: http://fellrnr.com/wiki/GPS_Accuracy There are some foot pods that will outperform GPS.
They don’t in real running. After seeing his page I got super excited. They’re really accurate at the pace you csalibrate them too, then drift quickly once that pace changes. So if you camlivrat them at 7:30min/mile, then run 8min/mile they’re pretty far off. Especially if you’re a distance running, or looking for accurate pacing. I’ve tested it both on marathons and tracks. All current running watches and phone soft…
Stryd is a calibration-free technology. Motion capture technology is used to precisely track the movement of the foot at different running speeds & on different terrains.