CaptainCalc includes osmdroid (OpenStreetMap tools for Android).

osmdroid is licensed under the Apache License, Version 2.0.
Project: https://github.com/osmdroid/osmdroid
License: see "Apache-2.0.txt" in this folder.

Map data attribution (when online tiles are used):
  © OpenStreetMap contributors
  Open Database License (ODbL): https://www.openstreetmap.org/copyright