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
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