Los Piratas del FTA

http://www.omnistar.com/Support/SatelliteCoverageMaps.aspx

https://www.raspberrypi.org/forums/viewtopic.php?f=93&t=80436

http://gpspp.sakura.ne.jp/rtklib/rtklib.htm

http://rtkexplorer.com/another-raspberry-pi-rtklib-project/

http://www.instructables.com/id/Sub-Centimeter-GPS-With-RTKLIB/?ALLSTEPS

http://wiki.openstreetmap.org/wiki/RTKLIB-compatible_GPS_devices

http://gpsworld.com/tag/multi-constellation-receiver/