Is it possible to have a useful magnetic compass mounted atop a truck's dashboard, given all the metal and electrical fields? Close accuracy isn't required, just something that can provide the cardinal and ordinal points fairly accurately.

I'm also interested in pitch and roll indicators (bubble-level type devices that indicate the the degree of fore and aft and more usually side to side tilt through an arc, similar to those found on sailboats) suitable for mounting in a truck. Maybe a circular bubble level? They would be used for finding a level spot to park, not while the truck is in motion.

I know that GPS and my smartphone can do these things, but I'm old fashioned about having backups and not being reliant on electronics.

Thanks!