this is all bullshit. heck, you can even switch on your phone and nothing happens with the flight

it's not the 70's. current naviagtional equipment is quite advanced that interferences from a small ipod, your handphone, your wi-fi or even cdplayers don't do a thing.

you can google for more info

one thing i dun understand is why those pesky flight stewardess still insist to turn off any electronic devices, but didn't check for switched off phones. talk about paranoia