void OnOrientationChange( object sender, DroneDataReadyEventArgs e )
 {
     if ( !DroneOriginalOrientationSet && e.Data.psi != 0)
     {
         _sendDroneCommand.DroneOriginalOrientation = e.Data.psi;
         DroneOriginalOrientationSet = true;
     }
     else
     {
         _sendDroneCommand.DroneCurrentOrientation = e.Data.psi;
     }
 }
 void OnDroneDataReady( object sender, DroneDataReadyEventArgs e )
 {
     this._lastDroneData = e.Data;
     this.OnNotifyPropertyChange( "DroneStatusInfo" );
 }