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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.
@uname
The altitude influences many factors, even for trail running, unfortunately for ALL the smartwatches I have tried, even garmin or suunto, the altitude is never correct, at every possible reference it can be calibrated quickly BUT it always returns stoned to the next calibration.
However, having a reference when you proceed with the workout is still useful.
I was thinking about the GPS because I always see it among the information retrieved by the "recorder" and I think it is more reliable.
(but perhaps it drain more battery than the barometric altitude)