This App Features Super-Accurate GPS, and I Can’t Figure Out How It Works

This app features super-accurate GPS, and I can’t figure out how it works

Smartphone GPS is usually only accurate to about 4m (13 feet), so the idea of a smartphone navigation app capable of much more accurate spatial resolution piqued my interest enough to try it out. Then it got me wondering how the whole thing works.

Source: arstechnica.com