Comment by baldomo

You should check out OsmAnd [1] and their pro client, which is FOSS [2]. The maps are downloaded in svg from OpenStreetMap (available offline) and the app has a ton of features. Also i'm not sponsored, I just find the whole thing very useful

[1] https://osmand.net/ [2] https://f-droid.org/en/packages/net.osmand.plus/