I admit that the ADF has a penchant for The Big Clouds, HOWEVER, why remove a Nav-aid. Especially when CB's are not the only baddie, satellites are extremely sensitive to solar storms, although its highly improbable that a single Big Daddy would remove all 24 or more.
On a more realistic note, not only does the RAIM on the GPS fail fairly often, it sometimes doesn't indicate that it has. If you've ever gone into that autopilot rate one turn whilst both of you look at each other with the infamous, what the F!?k was that!, and realised you're 2 miles of course in zero viz in a very busy North sea, the VOR's no use to pilot nor beast, sooo.... in a TS free moment you check you're ADF radial and take the appropriate action. Not only can it save your arse, it can increase your airbound pleasure by being able to announce to your Scottish pax that England have won the odd sporting event. Why remove such glorious diversity.
