Effect of CAA Interference on GPS Navigation
'Case not proven', at worst, and more like 'Hooray for GPS, max. 2m error irrespective of aerial position'.
Our experience is that the top of the tail fin is one of the least practical sites for the GPS aerial, because the inevitable vibration shakes the plug off from underneath the aerial. It's a devil of a job to fish the plug back up from the bottom of the inside of the fin.
Interesting to read (Lu on 2nd January) of 'rotor flicker' causing problems with more traditional nav aids. Although we did not experience the same problems on our Bell 214STs (in the desert) that Lu describes, we did have a similar phenomenon on an A109. In this case the only way to eliminate the ILS Glideslope fluctuations (or reduce them to a flyable level) was to beep the rotor back to 98% Nr on finals.