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We weren't talking FOSS, we were talking self-hosted, and self-hosting OSM is ridiculous, especially if you want to do routing.
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The maps can be considered metadata. The data is the points and tracks, which should be self-hostable. I have them synced locally (desktop-mobile). The setup was admittedly an absolute PITA involving shell scripting and Python.
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The map data is great but I guess I really mean navigation, which is... not great.
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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. Obviously this is less relevant for regular car drivers.

And certainly the situation for FOSS public-transit navigation is still quite poor.

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> And certainly the situation for FOSS public-transit navigation is still quite poor.

https://transitous.org/ (https://github.com/public-transport/transitous) works quite well.

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