[fuzzy2]

I wonder if cycling is also affected. Theoretically, the watch should be in an almost ideal position on flat handlebars, if less so on drop bars.

[jerlam]

You move a lot faster cycling, so GPS errors are less significant because there is a longer distance between readings.

But also, cyclists are less concerned about specific speeds.

[jeffbee]

Cycling computers blend calibrated wheel sensors with GPS data to give the most accurate distance, too. I believe Apple Watch refuses to use bike wheel and crank rotation sensors, but Garmin does use them.

[fuzzy2]

Well, maybe not specific speeds, but… :-D

What you're saying makes sense, of course. I found some hundreds of meters of discrepancies in some rides (Apple Watch 4 vs. Karoo 2). Less than 1% of the total distance, of course.