GPS

Add information here about how Global Positioning Systems and Geographical Information Databases are used in extreme sports.


 * Articles:**

GPS Made Easy, Using Global Positioning Systems in the Outdoors by Lawrence Letham (ISBN: 0898868238)
 * Books:**

The History of Geocaching [|- http://www.geocaching.com/about/history.aspx] Geocaching -http://www.geocaching.com/ GPS Visualizer -http://www.gpsvisualizer.com/ GPS: The New Navigation [|-http://www.pbs.org/wgbh/nova/longitude/gps.html] GPS: The Role of Atomic Clocks [|- http://www.beyonddiscovery.org/content/view.article.asp?a=45]
 * Links:**

Landsat Program - http://landsat.gsfc.nasa.gov/ Terra EOS Flagship - http://terra.nasa.gov/ Terra Server - http://www.goodearthgraphics.com/virtcave/index.html TOPEX Ocean Topography - http://topex-www.jpl.nasa.gov/
 * Satellite Imagery Databases -**


 * Podcasts:**


 * Video:**