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http://oceanservice.noaa.gov/education/kits/geodesy/geo09_gps.html.
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(17) http://en.wikipedia.org/wiki/File:Mercator.jpg. Public Domain.
(18) http://pajk.arh.noaa.gov/sat.php. Public Domain.
(19) http://www.nationalatlas.gov/articles/mapping/IMAGES/latlong3.gif
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(21) http://www.outlook.noaa.gov/98hurricanes/images.html. Public Domain.
(22) http://commons.wikimedia.org/wiki/Image:Bryce_Canyon_road_map.jpg. Public
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