private void calcWorldPos() {
   if (project == null) return;
   for (int i = 0; i < obsUIlist.size(); i++) {
     ObservationUI s = (ObservationUI) obsUIlist.get(i);
     s.worldPos.setLocation(project.latLonToProj(s.latlonPos));
   }
   posWasCalc = true;
 }