Tuc
I believe that Flt Lt T's concerns were about the positional accuracy - your other points may have compounded this.
Further, the STANS CDU was indeed hard to see - but all the mavigator had to do was feed it to the HP's horizontal situation indicator (HoSI).
Now this may be news to many of you, but as far as I have seen, that the STANS was most commonly used via the main navigation display (the HoSI) didn't get a mention at any of the inquiries.
There was some little reference to the "steer meter" - calculating bank and displaying on the AI - but nothing about range & bearing on the main one!!
Nor did any of the pilots who visit this forum mention it.
How can this be? It's not a secret in civil aviation or in US military documentation.
No wonder debate never got as far as how GPS and Doppler data together generate bearing, range, and track by the time the data for a waypoint gets to the HoSI.
BOAC
Part has been sent (a while ago) and the rest will follow this week - just have to wait now won't we?