[freidenker]

And with Locus maps you can use OpenAndroMaps [1] as a map source.

With their map styles [2] OpenAndroMaps are IMO the best hiking maps you can get. They even added very precise elevation data from LIDAR scans recently.

[1] https://www.openandromaps.org/en

[2] https://www.openandromaps.org/en/legend/elevate-mountain-hik...

[mongol]

Locus also have a store where they sell offline maps very similar to OpenAndroMaps for very small amounts. Not sure if they include elevation data however.