Satellite Navigation Product Teams: GPS Basics
http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/gps/

Federal Aviation Administration


This site from the Federal Aviation Administration features basic GPS information. The site provides a brief description of the history and development of GPS, plus a directory of useful links and a library of program-related documentation.

This resource is referenced here:
Subject: Geography:Geospatial
Resource Type: Scientific Resources:Overview/Reference Work