Columbus V-800+ USB GPS Data Logger Receiver High sensitivity MTKII 3329 GPS chipset, 66ch, -165dBm, low power consumption EPS technology with 2.0m accuracy and improve the drift Supports up to 5Hz update rate, NMEA-0183 data protocol Support data logging up to 500K track points, continuous track log of 25,000km and play track back on the map Built-in backup battery to reserve system data for rapid satellite acquisition.