How Do Global Positioning Systems, or GPS, Work?
http://www.nasa.gov/audience/foreducators/topnav/materials/listbytype/How_Do_Global_Positioning_Systems.html

NASA, Video clip from NASA SCIence Files: The Case of the Technical Knockout


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A movie of students interviewing a NASA expert, who explains basic GPS principles. Simple, but clear description of how trilateration works with a two-dimensional model vs 3-D. Appropriate for the 6-8 grade range.

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This resource is referenced here:
Subject: Geoscience:Geology:Geophysics:Geodesy
Resource Type: Audio/Visual:Animations/Video
Grade Level: Middle (6-8), Intermediate (3-5)
Theme: Teach the Earth:Course Topics:Geodesy, Geophysics