I recently took a flight to Milwaukee, Wi i Took my gps with me and I was allowed to use it only when we were up at 31,000 ft mark and speeds of 650 mph. so on descent and landing it was put up in my carry on bag. I had no problems with mine at all. They acted like they really did not care? Or maybe like the other fellow said clueless !!!FA's ,,,, They will check you out real good at sercurity gates and If you get the wrong person , You will just about have to undress. It's neat to know how high you are up in the bird and going at least 650 mph,,,, The space shuttle flys at 17,000+ MPH so airplanes are slow compared to it.
Happy flying with your gps's ,,, and Happy Hunting for Geo-Caching stuff.
Continouswave