GPS: a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time difference for signals from different satellites to reach the receiver
http://www.gpseducationresource.com/
GIS: geographic information system or geographical information system, is any system that captures, stores, analyzes, manages, and presents data that are linked to location.
http://gisjobs.ca/
GNSS: Global Navigation Satellite Systems (GNSS) is the standard generic term for satellite navigation systems (Sat Nav) that provide autonomous geo-spatial positioning with global coverage.
http://www.space-careers.com/jobsearch/view_3029.html
GPS Website to practise and have fun
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