1) AOSP, not ASOP, you even spelled out the acronym and made this mistake twice,
2) OSM is phenomenal. OSM maps are not bad. IMO the accuracy, even in the US, is better than Google, particularly in rural areas. There's this project https://github.com/pnoll1/osmand_map_creation also that bundles in address data from OpenAddresses, plugging what is the biggest gap that gave Google a de facto monopoly. IMO it is a very, very important project. The only things I can see being a problem for some people at this point is traffic data, which is not a problem for me, and POI which to me is a non feature, it's basically advertising. And you can do much more with it than with google, I have overlay maps for example that show me all public lands in the US and which department controls them, as well as a light pollution overlay map. I would recommend OSM for navigation over Google any day of the week even beyond the fact that it is FOSS.