Yep, it's worse than the usual triangulation everyone thinks about. It's right there in the protocol, or why you'd better not let the GPS on all the time.

Now this is definitely a smart trick to estimate position in tunnels.

First time I hear about this application. It seems really nice, I'm taking it for a spin. Not sure I'll use it to replace OsmAnd just yet. That said it's UX seems better than OsmAnd so far.

Excellent deep dive in how GPS works. It goes all the way down to the signal processing. It's really nice to see how many layers of complexity this technology carries.