Now follow the instructions displayed in the app.
- Enable app permission for display overlay. The app will take you to the appropriate settings page.
- Grant the app permission to determine the location.
- In order for the overlay to open automatically when you start a navigation application, you must finally activate the accessibility service.
However, you should note that navigation apps are power-hungry – an additional app that constantly measures your speed via GPS drains the battery even more. You should therefore always have an external battery for your smartphone or a car adapter with you to charge your mobile phone in the car.