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I do the same. The app I use is called AlpineQuest, on Android, but there are others. Gaia is another very popular one, but they require a subscription which is behavior I can't condone from vendors or app developers.
AlpineQuest is a one time purchase and can download to locally store maps from OpenStreeMap, the USGS, and other sources. I prefer to use the OpenStreetMap "cycle and hike" map which usually pretty comprehensively displays dirt roads, trails, tracks, and so forth. It can't do turn-by-turn navigation but it has all the other GPS map features including waypoints (with import/export), routes (line on a map), and a whole ton of other features I'm probably not taking full advantage of.
You can just drop the .gpx route files for the BDR routes into it, for instance, and it magically works.
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