# Data Quality
**URL:** https://forum.windsporttracker.com/t/qualite-des-donnees/519
**Category:** Support
**Created:** [July 27, 2026, 8:20pm UTC](https://forum.windsporttracker.com/t/qualite-des-donnees/519 "2026-07-27T20:20:49Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@opoto](https://forum.windsporttracker.com/u/opoto)
#### Post date: [July 27, 2026, 8:20pm UTC](https://forum.windsporttracker.com/t/qualite-des-donnees/519/1 "2026-07-27T20:20:50Z")
Hello
When I started using WST in June, the data imported from my Coros watch was noted as “very good” quality (1.0), whether the data was imported via synchronization or via the GPX file exported from Coros.
But my sessions imported this weekend from the same Coros watch show very poor quality (5.2). The turns on the map look like angles instead of curves.
Looking at the FIT or GPX files exported by my watch, I notice that in June, as well as this weekend, they have 1 point per second, and the GPS coordinates always have 6 decimal places. So there is apparently no change on the Coros side.
On the other hand, when I export the data from my latest sessions from WST, some GPS points are missing compared to the imported file. Below, the red file is the original, the blue one is exported by WST.
- Does this difference explain the “very poor” quality? What are the criteria for this rating?
- Does WST filter the data on import? Why do some points disappear?
- Has there been a change in WST regarding these aspects since June?
Thank you (again)
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### Author:  [@WST](https://forum.windsporttracker.com/u/WST)
#### Post date: [July 29, 2026, 9:18pm UTC](https://forum.windsporttracker.com/t/qualite-des-donnees/519/2 "2026-07-29T21:18:31Z")
Does this only happen with the recent session, or are all sessions since with a bad quality rating?
As you changed the sport type, some settings might also have changed that cause this. WST does some analysis about the data quality and drops points with poor quality.
If you’d like, feel free to send me the FIT file to [support@sunbits.de](mailto:support@sunbits.de) — I’ll take a look within the next two weeks.
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### Author:  [@opoto](https://forum.windsporttracker.com/u/opoto)
#### Post date: [September 10, 2026, 10:42pm UTC](https://forum.windsporttracker.com/t/qualite-des-donnees/519/3 "2026-09-10T22:42:50Z")
After investigating, the problem turned out to be Coros, my watch’s app. Since those errors occurred, Coros has released several updates for both my watch and the Coros app, and the problem seems to be fixed.
So there’s nothing to blame WST for!
Thanks for the support