Product name:CHC I80 GNSS receiver Contellation traking:GPS, GLONASS, BeiDou, Galileo Static accuracy:2.5mm +0.5ppm, 5mm+0.5ppm RTK accuracy:8mm+1ppm, 15mm + 1ppm Channel:220 channels Internal momery:32GB Application:Topograc survey, engineering survey, Marine survey Special features:LED sreen, Tilt sensor, Ebuble