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As a reminder the NGS has custom CORS data files available for download that include GNSS (GPS + GLONASS) data.  You can access this through their User Friendly CORS (UFCORS) website.

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How do I know which base stations are GNSS capable?

The CORS map legend indicates base stations that include both GPS and GLONASS data (GNSS).  The boxes are color-coded for the epoch rate of the base station.

http://www.ngs.noaa.gov/CORS_Map/

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(Click image to view larger)

What Trimble Mapping and GIS receivers are GNSS capable?

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