Earlier quoted context omitted.
The map data is great but I guess I really mean navigation, which is... not great.
Yes, that's what's commonly said. Some anecdata I can offer: since last year I have used exclusively Osmand for navigating over 3000 km of cycle touring, on roads and paths of all types. The most common problem that arises is wrongly tagged surfaces (and occasionally access rights) for tracks and paths, i.e. for "roads" that do not even appear on the corporate maps. There is no comparison in terms of detail. Obviousl…
https://transitous.org/ (https://github.com/public-transport/transitous) works quite well.