gums - what other IRS/Nav systems can or cannot do is interesting but not relevant to post#1, a 767-375 about to set off, I take it, on an ETOPS Pacific route. In my opinion, there would be insufficient NAV info to continue. If you are telling me that the 76-375 will have full GPS capability, including track and altitude and this is fed to the FMC for alignment, then I will accept your assurance. I don't think it has more than POS. Certainly GPS derived track and alt were not available to crews on the (newer) 737NGs I flew or to the FMC (as far as I was aware).
As FE Hoppy says, why/how on earth the knobs got touched I know not.and a good hand slapping from a F/E would have sorted that out.
