TinyGPS biblioteka 

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super tikslus GPS:

http://navspark.mybigcommerce.com/ns-hp-gn2-px1122r-multi-band-quad-gnss-rtk-breakout-board/

NS-HP-GN2 : PX1122R Multi-Band Quad-GNSS RTK Breakout Board

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http://navspark.mybigcommerce.com/ns-hp-rtk-capable-gps-gnss-receiver/