public void SetFrameByTime(DateTime time)
        {
            GPSPositionDataLine position = dataStream.GetPositionByTime(time);

            // kinda ugly here, but too tired, still working just a day before thanksgiving, it's 6pm, the building is empty
            double min_dt    = Double.MaxValue;
            int    min_frame = -1;

            for (int i = 0; i < dataStream.Positions.Count; i++)
            {
                if (dataStream.Positions[i] == position)
                {
                    min_dt    = Math.Abs((new TimeSpan(dataStream.Positions[i].TimeStamp.Ticks - time.Ticks)).TotalSeconds);
                    min_frame = i;
                    break;
                }
            }

            if (min_dt < 4)
            {
                SetFrame(min_frame);
            }
            else
            {
                SetFrame(-1);
            }

            toolStripStatusSecond.Text = "Req.: " + time.ToString("yyyy-MM-dd HH:mm:ss.fff") + " Diff: " + min_dt;
        }