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**References** Global Positioning Tutorial  Careers in Geodesy. 1986. The American Geophysical Union Section of Geodesy. Washington, DC: American Geophysical Union. 30 pp. Geodesy for the Layman. 1984. Washington, DC: Defense Mapping Agency. Online at: https://www.ngs.noaa.gov/PUBS_LIB/Geodesy4Layman/TR80003A.HTM. Geodetic Glossary. 1986. Rockville, MD. National Geodetic Survey. 266 pp. Herring, Thomas. 1996, February. The Global Positioning System. Scientific American, 44-50. Hurn, Jeff. 1989. GPS: A Guide to the Next Utility. Sunnyvale, CA: Trimble Navigation Ltd. 76 pp. Schultz, Sandra S. and Robert E. Wallace. 1997. The San Andreas Fault. United States Geological Survey. Online at: https://pubs.usgs.gov/gip/earthq3/safaultgip.html. Smith, J.R. 1988. Basic Geodesy. Rancho Cordova, CA: Landmark Enterprises. 135 pp. Tinambunan, D. 2003. How do GPS devices work? ScientificAmerican.com. Vanicek, Petr. 2000. An Online Tutorial in Geodesy. Academic Press.
  Geodesy **Lessons** Welcome What is Geodesy? The History of Geodesy The Geoid What is a Datum? The Horizontal Datum The Vertical Datum Gravity The National Spatial Reference System The Global Positioning System CORS and GIS References
  More **Information** Roadmap to Resources Subject Review Is the Earth round? (Ocean Facts)  Geodesy Education Heard of geodesy? These videos from NOAA's National Geodetic Survey offer a deep dive into the science of knowing where you – and everything else is in the world!
  The National Science Teaching Association (NSTA) includes this resource in its database. NSTA provides educators and students access to Web-based, educationally appropriate science content that has been formally evaluated by master teachers.
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  **Last updated:** 02/26/21 **Author:** NOAA How to cite this article Contact Us


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