My Garmin 645 Watch Is A Lying Liar Who Lies

Post date: 2021-06-17 06:44:28

I've been tracking my running with a Garmin watch for the last year or so, and have found it very useful. This week, though, I've been staying with a friend who tracks his with an Apple Watch, and on two runs together, we have significant differences in elapsed time, distance, and speed when we were running right next to each other for exactly the same time and route.

On one approximately four mile run (4.0 by my watch, 4.15 by his) his watch showed a pace almost a full minute per mile faster than mine. A later run was less extreme, but still showed a 20s per mile difference in pace.

Anyone know what gives? Is this idiosyncratic, or is there a known discrepancy between paces measured by Garmin and by Apple? Anyone know which is likely to be accurate? (I would love for the Apple Watch to be the accurate one, because I will then have suddenly become much faster than I thought I was.)

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