Used a Garmin satnav from my window seat on a flight to/from NCE a few years back without any problems. Cabin crew saw it and said nothing. Great fun coming back up through England, where the satnav registered all the speed camera locations directly below the flight path. Constant clicks and beeps as we broke the odd 30mph limit here and there !! LOL
Also my daughter's teenage L-driving boy friends (not knowing the device had been used on a flight) were mightily impressed when they saw my fastest speed on the satnav was 555mph. They looked at my Citroen C5 and just scratched their heads. Doh.
