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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Mi
Altitude relative to start of run/hike would't need any calibration and still be pretty useful (unless your so high that thin air is a concern I guess thats what is of interest to most hikers anyway, or am I wrong here @uname)