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How To Use a GPS : How GPS Works 
howcast.com | Fri, Feb 27
A GPS works by using satellites to detect the location of the system and create interactive maps. Learn more about GPS works with expert tips in ...
www.howcast.com
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Related Photos
This Map Zooms In As You Unfold It [Maps]
With GPS and map software ubiquitous on every smartphone, it's a sad reality that paper maps have fallen by the wayside. With location-based searching, powerful zoom capaibilities, and a GPS chip tracking your every move, it's hard to deny the advantages of digital maps.
Sat, Jan 23 | from Gizmodo
