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There's a small version that goes on your ankle, called a North Paw. Get directions or order a kit here http://sensebridge.net/projects/northpaw/

I still want to try to glue a magnet to my finger. It is possible to get implants, but that's scary. Being able to feel magnetic fields must be awesome!

(http://gizmodo.com/5895555/i-have-a-magnet-implant-in-my-fin...

http://io9.com/what-you-need-to-know-about-getting-magnetic-...)

If Google Glass (or its descendant) ever becomes viable, a killer app would be an augmented reality "this way is north" arrow that's always there, floating in the sky.

I've also been really interested in using one ever since reading about them last year. Seems like it'd be a good Kickstarter opportunity.

I wonder if it could be done more subtly, perhaps with a few vibrating motors embedded in the skin around one ankle.

There is something similar to this that is already reality: people use a magnet on one finger to be able to perceive EM fields.

We have the ability to turn our senses off when we are going to sleep, so any "sixth sense" prosthetics should be switchable or at least not strong enough to disturb sleep.

I think there was some work into this called "SouthPaw", to contrast with the external NorthPaw.