To be honest I don’t think you swam far enough to to give the GPS a chance to record a track. Open water swimming is particularly difficult for GPS to track - it’s a combination of finding weak GPS signals in the short time the arm is out of the water…

I have completed a ride today with a friend (who had a Fenix2) and our distances, and in turn our speed are very different. Mine is 13.6k and his is 40.4k. When looking at the map, his is…

Do you know which is more accurate between the FR945 and 820?

There are quite a few threads on these topics but the gist is, to get the best distance/speed accuracy, use a wheel sensor and calibrate wheel circumference properly (either use auto calibration…

Each GPS point has a probable error of up to 5 meters - sometimes off to the side, and sometimes in front or behind you. So if you just add the raw distance between each point, you will get an overestimation of distance. And the in front/behind issue…

I do parkrun regularly.

My regular parkrun course has lots of tree cover and has many 90° bends in quick succession.

That always measured about 20% short on my vivoactive3, depending on conditions. With the 955 it usually measures about 10% long.

The straight out and back case was not what I was referring to. That should not report zero. It should accurately report a total of twice the "out" distance (since the "back" distance is equal to the "out" distance).

The…