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I used the Nike+ system both for rucking and running, indoors and out, for almost two years (2007-2009). I found that, if you take time to carefully calibrate the run and walk features, it is accurate to within 1/10th of a mile for every 3-4 miles. Drastic changes in speed would throw it off more, but it's generally a good tool to use. I used the foot sensor in conjunction with the watch. The sensor paired with the iPhone app was difficult at best, but I only tried it a few times when it first came out.
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Доверяй, но проверяй (trust, but verify)
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Robert A. Heinlein, The Notebooks of Lazarus Long
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