LangleyBastion - I understand that the only useful data from the engine satellite 'pinger' is the angle the satellite received the signal from. Since the satellite is in a fixed position in space relative to the Earth (Geostationary orbit), the last angle received gives a circle - rather a large one - on the Earth. The arc of this circle extends out over central Asia and down to the South Indian Ocean. It would be useful to have all the ping angles and timing,but this hasn't been released yet to my knowledge. With 30 min pings, the aircraft could be in a band +/- 300nm (approx, i.e. 29 mins flying range) of this arc.