Changes

==Further reading==

==Further reading==

*{{cite book|url=http://books.google.com/?id=lvI1a5J_4ewC|title=The global positioning system|author=Parkinson; Spilker|publisher=American Institute of Aeronautics and Astronautics|isbn=978-1-56347-106-3|year=1996}}

*{{cite book|url=https://books.google.com/?id=lvI1a5J_4ewC|title=The global positioning system|author=Parkinson; Spilker|publisher=American Institute of Aeronautics and Astronautics|isbn=978-1-56347-106-3|year=1996}}

*{{cite book|url=http://books.google.com/?id=t1lBTH42mOcC&printsec=frontcover&dq=GPS+and+GALILEO#v=onepage&q&f=false|title=GPS and Galileo|author=Jaizki Mendizabal; Roc Berenguer; Juan Melendez|publisher=McGraw Hill|isbn=978-0-07-159869-9|year=2009}}

*{{cite book|url=https://books.google.com/?id=t1lBTH42mOcC&printsec=frontcover&dq=GPS+and+GALILEO#v=onepage&q&f=false|title=GPS and Galileo|author=Jaizki Mendizabal; Roc Berenguer; Juan Melendez|publisher=McGraw Hill|isbn=978-0-07-159869-9|year=2009}}

*{{cite book|title=The American Practical Navigator – Chapter 11 ''Satellite Navigation''|author=Nathaniel Bowditch|publisher=United States government|year=2002}}

*{{cite book|title=The American Practical Navigator – Chapter 11 ''Satellite Navigation''|author=Nathaniel Bowditch|publisher=United States government|year=2002}}

* [http://ocw.mit.edu/courses/earth-atmospheric-and-planetary-sciences/12-540-principles-of-the-global-positioning-system-spring-2012/ Global Positioning System] Open Courseware from [[MIT]], 2012

* [http://ocw.mit.edu/courses/earth-atmospheric-and-planetary-sciences/12-540-principles-of-the-global-positioning-system-spring-2012/ Global Positioning System] Open Courseware from [[MIT]], 2012