@Override
          public Void call() throws Exception {
            GpsPoint tmp = trackLDMIO.getLastGpsPoint();
            Point2D newpoint = translateToPoint2D(mapDisplayAdapter.lastPos);
            trackLDMIO.addMarker(new Marker(newpoint, tmp.time + 500, tmp));

            tmp.time += 500;
            addGpsPoint(tmp);

            return null;
          }