The Telegraph correspondent in Malaysia put out a short video update earlier, pointing out that all the countries in that area are busy watching each other and carrying out naval exercises but not letting on to each other. So several countries may know more than they are letting on via local radar and shipping capabilities. Maybe this is why the Malaysian military backtracked over the radar tracking of MH370, did not want to nearby countries know their capability. Maybe also they tracked it further than they are letting on?