Regulation Mode was designed to conform to USGA rules regarding Distance Measuring Devices (DMDs)
Links to explanations of USGA rule 14-3
The non-conforming features that are removed from the app include:
-Real-time feedback of shot distances
To enable Regulation Mode, access the settings menu and select the Regulation Mode tab move the slider. You can enable and disable Regulation Mode without having to uninstall/reinstall the application.