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== Enllaços externs ==
{{Commons category|Differential Global Positioning System}}
* [http://www.sirent.inlis.gov.sg SiReNT information page]
* [http://www.tfhrc.gov/its/ndgps/02072.htm US NDGPS fact sheet]
* [http://www.navcen.uscg.gov/?pageName=dgpsMain USCG Navigation Center National DGPS system]
* [http://www.navcen.uscg.gov/?pageName=dgpsCoverage USCG coverage maps]
* [http://www.ccg-gcc.gc.ca/eng/CCG/DGPS_Home Canadian Coast Guard DGPS information (English)]
* [http://www.ccg-gcc.gc.ca/fra/GCC/DGPS_Accueil Canadian Coast Guard DGPS information (French)]
* [http://www.hydro-international.com/productsurvey/id10-RTK_DGPS_Receivers.html Product Survey on RTK DGPS receivers] for (mainly) hydrographic use
* [http://www.coaa.co.uk/dscdecoder.htm DGPS Decoding Software]
* [https://web.archive.org/web/20120315182433/http://www.ndblist.info/dgnavlist.htm Useful DGPS Links, Databases and Resources]
* [http://www.gnsspro.com/referencestations.php Worldwide database of IALA DGPS Reference stations on an interactive map]
[[Categoria:Topografia]]
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