For sub-inch accuracy levels, consider the 220-channel AgGPS 542 GNSS base station. GLONASS is already unlocked, and the 450 or 900 MHz RTK radio is integrated. It can be used as a mobile or fixed-base station. The AgGPS 542 also supports an internet connection. This allows you to connect your base station to the World Wide Web and transmit RTK corrections via mobile phone network. This is very useful if you have to work greater distances away from your base station or suffer from radio signal loss in hilly terrain.
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AGGPS 542 GNSS Base Station