PersonFromPorlock, I plugged your numbers into an online Radar Horizon Calculator, and they jibe. However, you said "these numbers don't agree with the observed altitude of MH370". I don't think we (the public) have altitude data after the transponder is turned off, where are you getting that? The official Malaysian conclusion is the disappearance of MH370 is due to "human intervention", and that is clearly a bitter pill for them to swallow. Much better for them if it is Boeing's fault. Flying low, disappearing off the radar to the NW, then turning south is brilliant- if your objective is to become famous for disappearing. Without the Marsat data we would never know that MH370 turned south and kept flying for many hours. It would have been the perfect crime.