The Global Positioning System: www.aero.org/publications/GPSPRIMER/index.html [1], www.navcen.uscg.gov/gps/default.htm [2], www.navcen.uscg.gov/gps/geninfo [3], https://gps.losangeles.af.mil/jpo [4] and news://sci.geo.satellite-nav [5]
GPS Data Sources: cddisa.gsfc.nasa.gov [6], www.ga.gov.au/nmd/geodesy/argn [7], igscb.jpl.nasa.gov [8] and earth-info.nga.mil/GandG/sathtml [9]
GPS Data Formats: www.aiub.unibe.ch/download/rinex [10], www.nmea.org/pub/0183/index.html [11] and home.mira.net/~gnb/gps/nmea.html [12]
GPS Receivers and Open Source: sharc.sourceforge.net [13], www.sirf.com [14], gpsbabel.sourceforge.net [15], gpsdrive.kraftvoll.at [16], www.cstr.ed.ac.uk/projects/festival [17], wigle.net [18], home.earthlink.net/~cwkelley [19], www.mgix.com/gps3d [20], www.pygps.org/gpsd/protocol.html [21] and www.unavco.org/facility/software/teqc/teqc.html [22]
Getting Started with GPSTk: gpstk.sourceforge.net [23], www.perforce.com/jam/jam.html [24] and www.doxygen.org [25]
Future of GPS and GNSS: europa.eu.int/comm/dgs/energy_transport/galileo/index_en.htm [26]
Links:
[1] http://www.aero.org/publications/GPSPRIMER/index.html
[2] http://www.navcen.uscg.gov/gps/default.htm
[3] http://www.navcen.uscg.gov/gps/geninfo
[4] https://gps.losangeles.af.mil/jpo
[5] news://sci.geo.satellite-nav
[6] http://cddisa.gsfc.nasa.gov
[7] http://www.ga.gov.au/nmd/geodesy/argn
[8] http://igscb.jpl.nasa.gov
[9] http://earth-info.nga.mil/GandG/sathtml
[10] http://www.aiub.unibe.ch/download/rinex
[11] http://www.nmea.org/pub/0183/index.html
[12] http://home.mira.net/~gnb/gps/nmea.html
[13] http://sharc.sourceforge.net
[14] http://www.sirf.com
[15] http://gpsbabel.sourceforge.net
[16] http://gpsdrive.kraftvoll.at
[17] http://www.cstr.ed.ac.uk/projects/festival
[18] http://wigle.net
[19] http://home.earthlink.net/~cwkelley
[20] http://www.mgix.com/gps3d
[21] http://www.pygps.org/gpsd/protocol.html
[22] http://www.unavco.org/facility/software/teqc/teqc.html
[23] http://gpstk.sourceforge.net
[24] http://www.perforce.com/jam/jam.html
[25] http://www.doxygen.org
[26] http://europa.eu.int/comm/dgs/energy_transport/galileo/index_en.htm