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From a users perspective, its difficult to know exactly how accurate your wearable is.

It made all the pain worthwhile.

I ran London Marathon with Garmin and Apple Watch

I finished the race with a chip time of4:00:54 respectable, but slightly shy of my sub-four-hour goal.

Garmin Epix Pro: statistics

The Garmin Epix Pro is my everyday running watch of choice.

My Garmin recorded my total distance as 42.81km.

I ran London Marathon with Garmin and Apple Watch

The Epix Pro recorded my average pace at 5 minutes, 38 seconds per kilometer, or 5:38/km.

Apple Watch Ultra 2: statistics

This is where things get interesting.

Apple, in its customer-friendly approach, provides the data only to the second.

I ran London Marathon with Garmin and Apple Watch

Maybe this is where my extra 0.4km was registered.

Honestly, the difference is minor, especially over four hours of effort.

However, Strava processes GPS data with its own algorithm, so there are slight differences.

I ran London Marathon with Garmin and Apple Watch

Conclusion: Are the differences significant enough to matter?

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I ran London Marathon with Garmin and Apple Watch