Eric Carr from Loopt discusses the various positioning technologies available on mobile phones in depth on TechCrunch: http://www.techcrunch.com/2008/06/04/loc

Eric Carr from Loopt discusses the various positioning technologies available on mobile phones in depth on TechCrunch: http://www.techcrunch.com/2008/06/04/location-technologies-primer/ http://www.techcrunch.com/2008/06/04/location-technologies-p... Actual (unassisted) GPS is free when the device supports it, but is typically slow to first fix, power intensive, and rarely works indoors.