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== External links ==
* [https://web.archive.org/web/20130518041701/http://www.gps-practice-and-fun.com/software-gps.html Software GPS has many advantages]
* [http://home.earthlink.net/~cwkelley/ A starting point for learning about GPS with Open Source Software] {{Webarchive|url=https://web.archive.org/web/20120830101733/http://home.earthlink.net/%7Ecwkelley/ |date=2012-08-30 }}
* [https://gpsgeometer.com/en/blog/mitigation-of-ionospheric-effects-on-gnss-positioning Mitigation of ionospheric effects on GNSS positioning]
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