The problem of concern with the SuperTANS at the time was not interference, etc but fundamental accuracy
Walter, I think you should read the whole post.
EMI was an acknowledged problem.
What would cause your fundamental inaccuracy? SuperTANS is a simple rubbish in, rubbish out calculator. Inaccuracies could be caused by sensor input error, failure, signal interrupt or data corruption; such as having a faulty GPS, which I mentioned and MoD admitted (and yet continue to deny!).
Also, the SuperTANS may be receiving accurate information, but if the display is faulty or damaged (or, as in the Chinook, very difficult to see in bright light), then the information is useless as it is not presented to the crew.
You post as if I am completely wrong, but in fact we are in total accord on this point.