Is there some sort of secret FAA IFR book somewhere. I finished my oral for my CFII and I had three FAA guys sitting in. Two of them were OJT and the other one has over 40 years of experience. One of the OJT was quizzing me, while the other two were taking notes. After we were done the senior dude pulled me aside and said that I were lucky because he would of failed me on everything I said because of my knowledge, not lack of teaching. I asked him I got all my information from the AIM and twenty other FAA books. Told me something about the GPS that it has to be within a nanosecond and if one second off you would be 178,000 miles off course, I think, but he still haven't answer my question. Any good ideas.