So what's new ?
The 707 had the compass fluxgate device ( that provided the magnetic heading reference ) behind the lining of the First Class hatracks (overhead stowage in todayspeak) because, I believe, putting it out on the wing which was more desirable, caused problems due to wing bending motions, or so we were told.
Experiencing navigation problems one day, I was asked by the Captain to check the hatracks, which bore a prominent notice stating that electrical devices must not be stowed between two very obvious marks painted on the edge of the hatrack about a yard apart.
I found a bag containing a tape-recorder, one of those devices about the size of a Remington typewriter, that used reel-to-reel tape on big drums but was what passed as a "portable" tape-recorder in those days positioned precisely in the forbidden area, and the permanent magnet in the loudspeaker of this device was deflecting the Port side compass system.
Removal of same - I refrained from opening the door and tossing it out - corrected our problem, and ensured that the Captain steered the course that I, the Navigator, suggested.
Nothing new under the Sun.