CP running thread
Some GPS watches also might not account for any elevation changes along your route. For example if you’re checking your route on a map, it might look like 10km on the flat 2D map, but if you have a lot of hills along it, you could have run a bit more. I know that my runs showed a little lower distance on the watch, but once I uploaded it online, it was able to adjust it to the elevation profiles on the online maps. A practical application of Pythagoras Theorem. If the watch has a barometer it would do that, if not you wouldn’t see it until uploading the run to Strava or whatever.
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