"Inputting a wrong coordinate(if error greater than a preset nm from the previous coordinate) will trigger a warning lite."
What warning lite?
That's not true on the INS I know. Entering a wrong longitude will trigger a flashing of the coordinates, but that is cleared by merely hitting the Enter button again, so easily bypassed.
Why don't you guys accept the truth of these old systems, the LTN-72, the Delco Carousel IV, and the Collins INS-61B? I gave a real life example of wrong longitude being inputted and accepted, i.e., LAX Lat and DEN Long, yet you chant it can't be done.
Nome is about 300 degrees from ANC. Sakhalin is about 240 degrees. Please explain.