A More Accurate GPS Device

      I’ve always wondered just how accurate our GPS devices are.  Frequently they are reported to be accurate to approximately 20 feet.  My Garmin unit says (after acquiring four or more satellites) it is accurate to + - 9ft.  However, over the next 10 years there will be a series of GPS satellites launched to replace each of the 24 existing satellites, which will provide a variety of improvements.  The most recent launch was in Cape Canaveral, Florida on May 27, 2010 when the Delta IV rocket was launched with Global Positioning System GPS IIF SV-1.  The mission of this 10 year project is to receive stronger and more accurate signals, which will bring accuracy within 3 feet and provide a stronger indoor signal.  Increased signal strength sounds good.  Makes me wonder though, could some consider it an invasion of privacy at some point.  Where does it stop?  Here's the rocket launch of the next generation of GPS satellites.  This launch is in English.