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You can import GPS data from most other sources provided they allow exporting to a GPX file.
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Below is a list of guides provided by other companies detailing how to retrieve this data
https://refsix.zendesk.com/hc/en-us/articles/4404835817361-Upload-REFSIX-Matches-to-Strava
Exporting your Data and Bulk Export – Strava Support
Retrieve File Manually: How Do I Export Data Out of Garmin Connect? | Garmin Support
What information can I export from the Suunto app?
How to export workout data from COROS and manually upload to 3rd party apps – COROS Help Center
Retrieve File Manually: How do I export individual training sessions from Polar Flow web service? | Polar UK