GPS: Porovnání verzí

|+ [http://en.wikipedia.org/wiki/List_of_USA_satellites Počet družic]<ref>{{Citace elektronické monografie | url=ftp://tycho.usno.navy.mil/pub/gps/gpsb2.txt | titul=UNITED STATES NAVAL OBSERVATORY (USNO) - BLOCK II SATELLITE INFORMATION }}{{Nedostupný zdroj}}</ref><ref>[http://www.glonass-ianc.rsa.ru/pls/htmldb/glonass.collectors_content.get_gps_ru_as_xml GPS constellation status] {{Wayback|url=http://www.glonass-ianc.rsa.ru/pls/htmldb/glonass.collectors_content.get_gps_ru_as_xml |date=20090207004029 }}. Russian Space Agency. [[9. duben]] [[2008]]</ref><ref>[https://www.navcen.uscg.gov/?Do=constellationStatus GPS Constelation Status]. NAVSTAR Navigation Center [[9. duben]] [[2008]]</ref><ref>Doug Louden: [http://www.navcen.uscg.gov/cgsic/meetings/USSLS/May_2006_Meeting/03-Const%20stat06%5B1%5D.ppt Navstar GPS Constellation Status] {{Wayback|url=http://www.navcen.uscg.gov/cgsic/meetings/USSLS/May_2006_Meeting/03-Const%20stat06%5B1%5D.ppt |date=20061217140653 }}23. květen 2006</ref><ref>Matthew Smitham: [http://www.gps.gov/multimedia/presentations/2014/09/ION/smitham.pdf]10. září 2014</ref><ref>[Current and Future Satellite Generations http://www.gps.gov/systems/gps/space/] </ref><ref>[http://gpsworld.com/gps-iii-nine-and-ten-procured-targeting-2022-launch/ GPS III 9 and 10 procured, targeting 2022 launch] October 3, 2016</ref>