The following list shows, which permissions are needed by the app and whats the reason for it.
Internet: synchronization of the campsite basic data, download photos and reviews, working with the map
Media/Files: caching of campsite pictures and map elements
Location: working with the map, calculation of distances to a campsite
Call: direct call to a campsite within the app
Contacts: add campsites as a contact in address book
Invoice Service: INAPP purchases (e.g. for advertising deactivation)
WakeLock: download of big files for offline map
The following external services are used within the app:
AdMob (Google Inc.)
Google Maps
Firebase
OSMDroid
Mapsforge