This may be an old question, but let's see what opinions are out there.
You have probably seen these little compasses sold as car accessories,
meant to be attached to the windshield or the dash board. Knowing about
the effect of a Faraday cage, does anyone anctually believe they work
properly? Has anyone actually bought one?
I know for a fact that the good compass I use for hiking ceases to work inside my
car. Depending on position it's either completely useless or at least very
unreliable, even close to the windshield. So what's up with those seemingly
useless car compasses? Are they only for convertibles? Or maybe for plastic cars?