Apologies, my point was more that in the Azores many of the procedures are Locator or NDB which is why I used that example, not necessarily you will have more problems there. I agree with englishal that much comes down to "fittings".
I0540 Yep! I would back it up with GPS if available, if the kit is available then use it....we also have the added benefit on some occassions of the Flight Inspectors equipment down the back for a 3rd opinion!