Roy Smith wrote:


How much integrity does an ADF have? I'll take an non-RAIM-ified
purple line over "it's still beeping" any day.

All that "proves" is that ADF, at least the way its used in light aircraft,
is no good.

OTOH, in Eastern Europe, where NDB approaches used to be the only way to get
into a lot of places, and the aircraft had RMIs and two ADF receivers, the
pilots got good results in lock-stepping the usual two NDBs.

This is something the USAF neither understood nor was equipped to do when
they took out Secretary Brown.