...it was obvious that the pilot was well off course when above FL110
To who? In hindsight, yes, agreed, after plotting it out; but at the time what were the controllers (the three sectors involved (WOL, BLA and HUM) = three alerts) using to assess this "obvious" deviation from track?
This has nothing to do with using the radar "correctly".
As far as I know the GPS RNAV/GNSS points were not in the data set at the time, so rerouting it to accurately describe the RAM corridor wasn't an option; thus the only reference point was the navaid/aerodrome; where the aircraft was not going; probably hence no advice to the PIC.
This probably has everything to do with a pilot being below the MSA still in a white/grey/black puffy lump of clag; yes the BLA GPS RNAV can get you lower than the MSA of 3500 within 10NM; but we all know you have to be on the damn thing.
From my untrained eye and from memory the aircraft appears to have gone to EE not ED; but flown the approach as if going to/from ED; sorry I have this all wrong.
Dr, You
will get advice from ATCs , about being in RAM in G too, in radar coverage, IFR, when you aren't on the CTAF, and your diversion from track
is unexpected; the
same RAM rules apply to all classes of airspace; ie there are only one set of rules.