Been thinking about these data, and generally concluded that speed is a very crude measure, depending as it does on starting and stopping tracking at the correct times. That’s OK for mechanised transport, usually, although I do tend to leave it running as I hang around at a bus stop waiting for the next bus, because I reckon it is the average trip speed that matters. On the bicycle, though, I tend to pause the workout on my watch but leave the overall track running. Average speed from Compass is thus very different from average speed from the watch. No big deal.
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