Pretty much what grogmonster said...
Considering that 3 days ago the GPS equipage mandate became effective, thus enabling Airservices to rip out half their ground based navaids and mandating GPS as prime means navigation for all IFR aircraft......
It doesn't have a TSO 145 or 146 GPS either.
I would suggest that 'good old OZY' does not meet the minimum requirements for IFR navigation anymore and probably can't be used IFR
...than add all the Part 61 changes for instrument rating....
I am pretty sure that to use an NDB you just have to demonstrate bearing needle tracking and it doesn't have to be an approach.
Someone is not giving you the correct information
Alpha