[edly]

I'd like to use OSM for everything, and while their road mapping is second to none, their POI mapping is lacking and there are no good navigation apps that use OSM data. The best one I've used is Magic Earth but there are some strange design quirks, such as no auto-zoom on the map when navigating by car.

There also comes the issue that OSM in general is not optimized for navigation. Interstate ramps and exits, for instance, are named improperly or not named at all.