Went for a short distance swim together with a friend and realised that the same distance was logged differently. Any ideas what might be the issue?

Went for a short distance swim together with a friend and realised that the same distance was logged differently. Any ideas what might be the issue?
Even if you and your friend do an activity together, it is possible to get different distance calculations on Strava. Things like GPS drift, GPS signal loss or a 'jumpy' GPS track can cause your activity to report more or less distance than you actually traveled.
Please feel free to check out our support article on this topic here: Why is my activity's distance different than my friend's
You can switch your distance on Strava if you would like to compute your distance from GPS data rather than the distance stream recorded by your device.
To swap your distance stream:
If you would like to revert the change, you can click the same link and click "Revert Distance".
For more information, see our article on How distance is calculated for your activity.
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