Had started nGPS - location using geomagnetic-field. But the concept never took off the drawing board. Limitations were mainly the inaccuracies with the consume

Had started nGPS - location using geomagnetic-field. But the concept never took off the drawing board. Limitations were mainly the inaccuracies with the consumer-grade sensors in smartphones. http://thecodeartist.blogspot.com/2012/01/android-sensors-and-location-based.html http://thecodeartist.blogspot.com/2012/01/android-sensors-an... With the current gen hardware in the phones. 1. Globally, nGPS is only good enough to act as a secondary source or an AGPS to reduce GPS time to inital fix. 2. Locally, it is already possible to map out the ambient magnetic-field of the terrain once and then rely on pattern matching to determine one's location within the terrain. The tipping point here is the size of the terrain that needs to be mapped.