Yeah it is mostly BS when it comes to electronic devices. I can understand mobile phones being switched off as it can interfere with the radio communications, but a ipod, digital cameras as not EMF unfriendly.
The only way I could get a GPS lock was hold it to the window for about 5mins. I did not think it would work, but it did. Next time I fly I will try it with my phone GPS. Might do some 0-100km/h and 1/4 miles times on takeoff