Regarding the NDB's - I would suggest that each and every IFR Public Transport aircraft has at least two (and a few DME's or so). Archiac - yes, but that is reflected in the minima to which you operate. And they are freqently used in anger. And as for sharing the sky with matey boy and his single engined tupperware and DIY Instrument Rating, well I'd suggest that if he's innocent, he'll get off. If not,