If you already have the Glassy Zone:
On the Glassy Zone app menu, go to SURF mode and double tap to activate the GPS just before you start the session. The message GPS ON will appear on the screen. Make sure that the GPS is activated by activating your Glassy Zone and checking that the time is displayed in orange. If the time is displayed in red, this means that it is not working.
If you still don't have the Glassy Zone:
Once you get out of the water, you must open Glassy app and add a session from the main screen. There you can record all the data, weather conditions and even add a photo (optional).