Interesting. I'll admit I don't fly commercial aviation much, but the few flights I've been on taking my GPS along and using it in flight was never an issue. The only issue was disabling the "lock on road" function

It sure is nice to be able to jump in a rental car, throw your GPS on the dash and drive straight to a destination in a town you've never visited. A lot of rental cars come with GPS units, but they aren't nearly as friendly as one that already has your destination programmed in.

On the subject of GPS, just received my Garmin GPSMAP 60CSx and I'm waiting for a 2 GB micro SD card to add additional road and topo maps.