Lol. Okay. This article is shit and wrong.<p>GPS has had readily achieved kinematic (while moving) accuracy 10 mm horizontally and 1000 mm vertically since 2000 with a base station or good WAAS, and good constellation coverage (flat land), even before Clinton turned off SA (because base stations defeated it).<p>Cell phones use tower+GNSS triangulation, so accuracy and precision varies with tower coverage and satellite positions of the constellations.<p>In the 2000's, farm and industrial equipment could accurately calculate machine angle using 2 GPS antennas. It's only improved since then as things changed.<p>Besides numeric peeing contests, there is nothing substantive in this article, just vague, ignorant, rhetorical FUD.