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A comment on IPhone 4S has GLONASS in addition to GPS. Parent comment
In Europe (and of course in Germany) the federal governments offer realtime gps correction data via IP or 3G (radio was shut down a few years ago).
They offer a precision of 1cm-2cm used together with GPS/GLONASS
PDF: http://www.sapos.de/pdf/Flyer/2004Flyer_e.pdf
(Sorry, German language only:)
http://www.sapos.de/ http://sapos.bayern.de/service.php
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In Europe (and of course in Germany) the federal governments offer realtime gps correction data via IP or 3G (radio was shut down a few years ago).
They offer a precision of 1cm-2cm used together with GPS/GLONASS
PDF: http://www.sapos.de/pdf/Flyer/2004Flyer_e.pdf
(Sorry, German language only:)
http://www.sapos.de/ http://sapos.bayern.de/service.php