GPS data logger records location data from GPS signal. Record every position of the device holder as a pre-set interval and then upload those data on PC mapping software for viewing the holder's whole day moving path. Build-in flash supports two memory ways: According to time intervals,up to 54000 points could be recorded,format is DATA/TIME/Lon,Lat/Speed; According to distance intervals,up to 27000 points could be recorded,format is DATA/TIME/Lon,Lat/Speed/Distance; It supports sequential 10days data saving based on recording GPS data every 5 minutes.User can easily upload the recorded points to Google Earth and Google Maps by USB cable or Bluetooth (optional). customs software will show the moving path and abnormal alarm on the map.