«Today, I am pleased to announce that the United States will stop the intentional degradation of the Global Positioning System (GPS) signals available to the public beginning at midnight tonight…»(Statement by the President Bill Clinton regarding the United States’ decision to stop degrading Global Positioning System accuracy, May 1, 2000)
http://clinton3.nara.gov/WH/EOP/OSTP/html/0053_2.html
http://news.cnet.com/8301-17938_105-20003830-1.html
2010 CES: The Future of GPS Navigation
http://blogs.insideline.com/straightline/2010/01/2010-ces-the-future-of-gps-navigation.html
http://en.wikipedia.org/wiki/Global_Positioning_System
Zelig – Gioele Dix 08-12-2008 – Il navigatore satellitare: