I also have an Android phone and eTrex 30 and I am at least somewhat careful about app permissions. I use
OsmAnd+ (
https://play.google.com/store/apps/d...et.osmand.plus) which uses maps based on data from
https://www.openstreetmap.org. While OSM may not be up to par with Google on streets, it has a couple of advantages that I simply love: 1) it has trails for many parks, 2) It has parking areas, 3) if something is not there yet, I can add it. The trail coverage is far from complete but