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No, as far as I know it only needs the GPS in order to find and track you. I know the GPS icon pops up when using it, but have not had reason to turn off cellular data to see if that would cause an issue.
It would of course need data connection to sync your workouts to the net, but you could always do that after running.
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For Americans war is almost all of the time a nuisance, and military skill is a luxury like Mah-Jongg. But when the issue is brought home to them, war becomes as important, for the necessary period, as business or sport. And it is hard to decide which is likely to be the more ominous for the [terrorists] -- an American decision that this is sport, or that it is business.
-D. W. Brogan, The American Character
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