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

Articles:

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

Links:
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

Satellite Imagery Databases -
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/

Podcasts:

Video: