Inmarsat
Correct me if wrong, but could the plane have landed or crash landed with some systems still active along that 40 degrees relative angle extrapolated through Inmarsat/plane TX-RX range-calc and continued to ping the satellite while on the ground?
How often does the pinging occurs?
Since it seems possible to judge movement with a single radio reference only by measuring changes in distance from the satellite thus impossible if flying along an equidistant path (40 degrees in this case), could it be the plane wasn't even moving at all? Is the Inmarsat ACARS system on the 777 active while on battery power or does it needs engines or APU to be powered?