References:

• Chew, L. (1998). GPS I: Fundamentals global positioning systems. Paper presented at the meeting of AAPT/PTRA Workshop, Orlando, FL.
  
  

• Garmin Corporation. (1999). GPS 12 personal navigator owner's manual and reference. p. 6-7.
  
  
• Kaplan, E. D. (1996). Understanding GPS principles and applications. Boston: Arte House.
  
  
• Leick, A. (1995). GPS satellite surveying. New York: John Wiley and Sons.
  
  
• Parkinson, B. W. (1996). Introduction and heritage of NAVSTAR, the global positioning system. In B. W. Parkinson & J. J. Spilker, Jr. (Eds.), Global positioning system: Theory and applications (pp. 3-28). Washington, DC: American Institute of Aeronautics and Astronautics, Inc.

Related Websites:

• GPS: A New Constellation http://www.nasm.edu/gps/intro.html
  This website describes navigation before the invention of the GPS, how the GPS has revolutionized, how the GPS works, and presents other navigational information.
  
  
• GPS: Global Positioning System Overview http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html
  This site provides a good overview of the GPS.
  
  
• GPS World http://www.gpsworld.com/
  This website provides a 2000 GPS Buyers Guide, GPS articles, and other various information.
  
  
• How Stuff Works http://www.howstuffworks.com/gps.htm
  This is a good starting point for finding more information about how the GPS works.
  
  
• Look-up Latitude and Longitude http://www.bcca.org/misc/qiblih/latlong.html
  At this site you can search for the latitude and longitude of various major cities in the world.
  
  
• View Above Earth http://www.fourmilab.ch/earthview/vlatlon.html
  At this site you can locate an aerial view of the earth at a specified latitude and longitude.