iMusicTrack is an app that will detect user defined sudden impact and save information immediately. It uses the iPhone builtin gravity sensor GSensor with satellite navigation system GPS to record the data including:nForwardview video nTime and datenVehicle speednDirectionnGPS coordinates latitudelongitudenThe user can easily and directly get the recorded video and data through iTunes.nnIn addition, there are two ways to start video recording. One of the ways is directly pressing Start Record Video button on the home page. Another way is turn on the Auto Record Mode. When the vehicle is being sudden crashed, the video recorder will automatically start. The map view, the vehicle speed and the direction view will show on the camera display as well for providing more information.nnThere have the Setting button on the home page, set the maximum vehicle speed for activating alert sound and vibration sensitivity for activating video recorder. The range of vibration sensitivity value is 0.1 to 4 0.1 is most easy to activate and 4 is most difficult to activate. When the value is changed, press Save button to save the setting.