The A221™ Smart Antenna offers fast, portable, professional-level differential GPS (DGPS) accuracy in a rugged, all-in-one enclosure. Powered by Hemisphere GPS’ powerful dual-frequency Eclipse® OEM board, it delivers *2 – 50 cm accuracy, depending on the differential source used.
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Source: “Resources & Support.” Hemisphere GNSS. N.p., n.d. Web. 04 June 2017.