Waterspeed is a freemium app. You can access many features for free, but there are things that are available only for PRO subscribers. 

Please note that the Apple Watch app is offering all tools for free, but the Wind forecast complication (PRO users).

See below the list of things you have to unlock by purchasing any Pro Subscription:

• Access to more than 5 tracks (from the 6th, activities are saved but not accessible)
• Cloud Sync between iPad and iPhone and Cloud backup
• Restore from local backup
• Play of a track
• Weather and Tides forecast
• Automatic Wind detection
• Statistics and Graphs
• Send to iPad
• Best TOP speeds (2 sec., 5 sec., 500m, 1KM etc.)
• GPX-CSV Excel export and Import GPX
• Strava Integration
• Countdown on the iPhone app
• Wind Complications on the Apple Watch
• Web App

The features above are available with an in-app purchase subscription of 1 month or 1 year. Prices can be different based on your country, please see the cost on the App Store of your device or directly on the related page of Waterspeed app.

The subscription, once purchased, will be auto-renewed every period until you cancel it 24 hours prior to the end of the current period.

Please note: You can unsubscribe from your iTunes account settings. Go to App Store, click on the picture of your user, then open the user details and click on SUBSCRIPTION.

Please note: the subscription is valid on any Apple device sharing the same iCloud account. You need 1 subscription for all your devices, such as iPhone and iPad. Click on RESTORE, from the purchase page of the app, to activate the second device.

The subscription is also available for Family Sharing.

For more details or issues, you can also see the official Apple Page: https://support.apple.com/en-us/HT204084