Gods knows m8, Its either a Trimble or Bendix and its an area GPS fitted to a pref A machine, certified to be used in controlled airspace.
THe GPS drops out a fair bit round here especially when GMC is running on the west coast.
FRA planes are jamming it off and on. Sometimes with a NOTAM sometimes without.
But the RIAM warnings havn't just been in the North of Scotland. Have had them in the North of England as well but again that might be FRA up to there usual tricks out of teeside.
MJ
And I am flying about 20hrs a week.