Open Positioning System (OPS)

See the following -

Student Proposes Open Source Alternative To GPS Based On Seismic Waves

Carl Franzen | The Verge | February 19, 2013

Global positioning system (GPS) satellites are great for getting around and looking up directions and smartphones and tablets, but they are controlled by the US Defense Department, which has degraded public signals in the past, and one European art student thinks that an open source alternative based on ground vibrations would be better. Read More »