[http://www.ign.fr]
[http://en.wikipedia.org/wiki/Global_Positioning_System]
[http://www.trimble.com/gps/index.shtml]
[http://www.gps.oma.be/gb/modern_gb_ok_css.htm]
[http://www.swisstopo.admin.ch/internet/swisstopo/en/home/products/services/swipos/gis-geo/vrs.html]
[http://www.gpsinformation.org/dale/nmea.htm]
[ftp://ftp.unibe.ch/aiub/rinex/rinex300.pdf]
[http://www.rtcm.org/]
[http://www.navcen.uscg.gov/pubs/dgps/rctm104/Default.htm]
[http://www.gpsworld.com/gpsworld/static/staticHtml.jsp?id=8000]
[http://www.navcen.uscg.gov/]
[http://cgls.uscg.mil/mailman/listinfo/gps]
[http://cgls.uscg.mil/mailman/listinfo/nanu]
[http://www.gpsworld.com/gpsworld/]
Tutorials Many of them already exist on-line. Some are well designed and edited, but often the explanations remain vague. We prefer not to add to the existing confusion and recommend the following selection of websites: - Wikipedia, the free encyclopedia - The Trimble tutorial is very good for surveyors - The Royal Observatory of Belgium has a good article about modernization. Some specific technical terms What is a VRS network A description of NMEA sentences RINEX (Receiver INdependent EXchange) format for post-processing data RTCM organization and the RTCM SC-104 format .... and a general glossary To find out the current status of the GPS constellation The U.S. Coast Guards website provides information directly from the U.S. Department of Defense (DOD). Temporary deactivations of satellites are indicated on the pages "Status" and "NANU" To consult specialized publications GPS World
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