Ah, to gps or not during flight.

the funny thing is, many airlines do not allow this. I am sure they are all quoting some FAA regulation, but that may or may NOT be correct.

As for GPS, it is indeed going to emit some RF, or EMF at a minimum, but I cannot imagine that a GPS which is inherently a one way signal and device that it could impact navigation. I mean the Bluetooth ones that I have of course emit RF and the signal over the bluetooth protocol, but I cannot imagine the plane is setup to receive this.

My thinking over the years, and this is years since 2001, is that they want to restrict it in order to keep people in the dark as to their EXACT position over the earth. Armed with the LON/LAT, and airspeed one could put the plane in an exact enough location as to allow someone on the ground to locate the aircraft with very high accuracy.

And THAT might be BAD!