... waterproof, dustproof and anti-drop.V30 Technical Parameters: Signal Channels: GPS: L1 C/A, L2E, L2C, L5 GLONASS: L1 C/A ... : WAAS, MSAS, EGNOS Module Technology: Trimble Maxwell 6 of advanced user-defined GNSS technology, Very low Noise GNSS carrier phase in ... : -55~+85 a lasted advanced multi-channel, multi-frequency RTK GPS system