This is getting way off thread (not helped by clogging it with a full quote each time - I wish pprune would disable this feature)
, you seem confused - nothing to do with circuits, NDB,.vor etc - but by raw data, I mean flight directors off = Verboten (and monitored by SESMA/FDM = angry phone call very soon thereafter!) in the three very large airlines I know of. If your SOPs permit FDs off, then fine and dandy - just don't trigger my TCAS while you're doing it!
Back to wizz