offline maps for android application

Question

Android

Good day.
I did not find the ability to use offline maps in the google map api, the question is which maps are better to use for offline work in the application.

Answer 1

OSM as one of the options

Answer 2

Not the maps themselves, but the app I used for offline navigation:
Rmaps: https://play.google.com/store/apps/details?id=com....