Strava:
you can manually upload to Strava or set it to automatically save to Strava after every activity. From the Settings page, click on Strava Login, and sign in Strava. Sometimes, if the activity is too big, or the Internet connection is not stable, the automatic upload could fail. In that case, please try to use the "Send to Strava" tool from the activity page or upload the GPX file to the Strava web portal.

Garmin:

1. you can manually export a GPX file and then import it into the Garmin app or web portal. 

2. Automatic Syncing Garmin Activities with Waterspeed
Please, read this article: https://waterspeed.crunch.help/en/how-to/how-to-import-from-garmin-connect

Note: this syncing capability is exclusively available for Waterspeed Pro users.

Relive:
Waterspeed saves a workout in the Activity App of your iPhone with map details. You will be able to use it to import in Relive and create your custom Video. Or you can export a GPX file and import it in Relive.

GPSAR for GPS-Speedsurfing: Waterspeed can export a GPX file ready to be imported on https://www.gps-speedsurfing.com. You can set the native integration with GPS-Speedsurfing, from the Settings page (read the related article).

Other formats: 

Waterspeed can export any activity in your Diary to a GPX file. It uses the Topografix standard and it adds Garmin format for Speed, Accuracy, HR, and Course. 

This feature is available from the sharing button of the Navigation detail page.

Waterspeed can also export to a CSV file, ready for Excel.

Please note: export is available only if you subscribed to Waterspeed Pro (see the related article for details).