As for the laptop, it depends...if the laptop user turned wireless internet on, then it would start emitting signals and they can interfere with radio equipment. If you dont believe it, put a wireless modem or mobile phone next to a working radio and see what happens to the radio signals.
It's true ! I could never understand why my radio didn't work in my 'home office' until the other day, when for the first time I already had the radio switched on as I started my laptop - the radio became unuseable as my laptop 'locked on' to the radio modem on the other side of the room
Very much doubt if that could affect the F.deck tho' ? Haven't "they" thought about that ? Don't believe the mobile phone thing, either, but anything that persuades people using them in public gets my vote, so keep up the myth.
Doesn't need electronics - had a 707 with heading reference problems once, found a tape recorder, you know, those things with big reels of tape that wind from one to the other, 'bout the size of an old Remington desktop typewriter ( remember ! ) lodged in the hat rack - where the compass fluxgate sensors were ! The permanent magnets in the innards were sending the compass bananas. Big notice telling passengers not to do that gleefully ignored. Wot's new.