I have been looking at JDX's latest junk. He can not place the aircraft anywhere. Errors in the INS, think the pilot just started up and left, did not update the INS or let it zero in on the takeoff location. I do not know yet how the INS and other nav systems work. But based on 32 years of flying, the INS may, even if not aligned to the present position at the beginning of flight, may get more on course during the flight. Need a 757/767 systems expert or pilot who pays attention.I cant find any topics where the issue of the FDR and flight 77's altitude at impact with the pentagon was debunked. any help?