You can still use the TomTom Sports App to do these things even when you are not connected to the internet:
You are told when the app is not connected to the internet and that you can make changes to settings when you are next online.
In addition, the data calculations that are performed by the Sports Cloud are performed only when an internet connection is available.
Note: The Sports Cloud is a network of computer devices that work together to provide secure, private storage of all your activity data. The Sports Cloud also provides computing power for things like body composition calculations, progress and trends. To learn more, please visit https://tomtom.com/privacy