R101 & Gps
I fly from Brimpton which is in the northern edge of R101. I have a Skymap II and a Garmin 12XL (used handheld on its own battery and internal antenna) and have never had an outage on either of them in the 4 years I have carried them. I depart and return to the field always to the north side of the runway centre line. I don't know anyone else who has had an issue in the vicinity. If anyone from the field had suffered from GPS issues there it would have been talked about in the clubroom.
I do find that my radio doesn't like to receive the airfield transmissions from near to the Kingsclere mast (even though I can see the airfield) but I can still listen to traffic in the circuit at Sandown from there. Strange.