If You want to find Your way in Germany you need a map. Google maps always needs an internet connection. This app is free and much better – based on the Open Street map: MAPS.ME . You download Your maps once and can use them with GPS without internet connection. Many points of interest are included, also routing for cars and pedestrians. Download the app in the Android app store:
Depending on the State, the card needs between 17 and 428 MB storage on your cell phone.