Multi-Constellation Tracking Hi-Target V90 Plus Gnss Rtk with Ihand30. Multi-Constellation Tracking: 220 tracking channels supporting GPS, GLONASS, GALILEO, BDS, and SBAS signals. High Precision Accuracy: Horizontal 2.5mm+0.5ppm and Vertical 5mm+0.5ppm RMS for static surveying. Smart Tilt Surveying: Built-in tilt survey with max 30-degree angle and electronic bubble calibration. Rugged IP67 Design: Dustproof, waterproof, and survives 2-meter falls onto concrete. Long Battery Life: 5000mAh Li-ion battery provides up to 12 hours of static operation. Multi-Network Connectivity: Supports GPRS, GSM, WCDMA, and WIFI for seamless data transmission. Integrated Linux System: Runs Linux3.2.0 with pre-loaded smart apps like NFC and voice assistance. Flexible Radio Modes: Switchable base/rover modes with compatible SATEL internal UHF radio.