On the side of HI-305III, there is a SD memory slot. User can insert the SD memory card containing the mapping software so that the GPS data and the map data can be accessed simultaneously via the Compact Flash interface from the host device like, PDA, laptop PC, etc... After the proper driver installed, with the SD memory card inserted, as soon as user plug the Compact Flash interface, there will be a folder created from host device. Beside using it as a complete GPS solution, HI-305III can also be a SD card reader in CF interface. One can store any file into any standard SD memory card and the file can be read or write via the Compact Flash interface. Specifications: Interfaces: Compact Flash type 1 & Mini-1394 Protocol: NMEA0183 GGA, GSA, GSV, RMC Baud Rate: 4800, N, 8, 1 Max. Update Rate: 1 Hz Datum: WGS84 Channel: 20 channel Frequency: L1, 1575.42MHz Hot Start: 3 ~ 6 sec. Average Warm Start: 34 sec. Average Cold Start: 46 sec. Average Reacquisition Time: 100 ms Position Accuracy: 7m 2D RMS, SA off Maximum Altitude: 10,000m Maximum Velocity: 600m/s Voltage: DC 3.3V+- 10% Power consumption: 90mA continuous mode Antenna Type: Built-in active antenna External Antenna Connector: MMCX (Optional) Dimension: Fold: 65 (L) x 48 (W) x 25 (H)mm Unfold: 116 (L) x 48 (W) x 22 (H)mm LED Indicator: 3D Positioning (blinking) or Searching GPS (on) Operating Temperature: -40° to + 80° Storage Temperature: - 55° to + 85° Operation Humidity: 95%, Non- Condensing Sensetility: Acquisition: -149 dbm Tracking: -159 dbm