I can vouch for OsmAnd, it really is a very nice piece of software. I use it all the time in the car and recently also on my bike. I must admit that it is not very intuitive, you have to spend a lot of time to get familiar with the interface. A little clunky.
Recently I found something that is really simple to use: "Soviet Military Maps"
https://play.google.com/store/apps/d...aps.free&hl=en
There is a free and a Pro version (3 euro), I don't recall the exact advantage of the Pro version. The name "Soviet Military Maps" may raise concern, but the app is really very straightforward.
With this app you can bulk-download OsmAnd maps (or other maps, but not Google maps) into the phone. I think it downloads tiles, not vector-maps so storage is inefficient but for a bike trip it doesn't bother me. You can use the app to plan a route: zoom in on the map until you have enough detail, then set your markers. Afterwards you can tell the app to start following the route from start to finsih, or in opposite direction. Simple. You can store multiple tracks.
While riding the track you get an arrow on the screen pointing to the next waypoint, and when you're within 20 meters of your waypoint your hear a "ding" and the arrow starts pointing to the next waypoint. Simple.
When I bike through the city I still use OsmAnd which works as a navigation system, but out in the woods without any OsmAnd roads and no navigation, this one is really simple.