For the full functionality of the Tilsberk HUD even with an inactive screen, it is important that the app also runs in the background without restrictions. Therefore, please check the following:
Android:
The battery optimization is not active for the Tilsberk HUD app and, if available, the calimoto app. You can find the setting for this in the system settings of your smartphone in the Tilsberk HUD app; there in the "Battery" or "Energy" section. The energy saving mode of your smartphone must be deactivated.
Please note: Depending on your smartphone model, the settings may vary slightly, be named differently or be located in a different place.
iOS:
The Tilsberk HUD app and, if available, the calimoto app, also require access to the location data in background mode. You can find the setting for this in the system settings of your iPhone at the very bottom of the list for the respective app. The location access must be set to "always".