I'm intrigued- how does a dual-NDB approach work? Have you got a plate?
It works badly if you try it high and fast with just one ADF. The infamous one is Dubrovnik.
Here's the link I get to the
EAD version. I don't know if it will work if you're not logged in to the EAD.
The USAF, with the US secretary of trade Ron Brown on board, managed to fly a 737-equivalent into the 2300 hill NE of CV.