Of course, a little time on the internet found several commercial knife and sheath guys using magnets. I also was directed to this magnet source:

http://www.dealextreme.com/products.dx/category.405~search.magnet

Anybody have experience with them?

I am considering whether one or more magnets would have survival uses. Detecting ferrous materials? Retreiving ferrous tools/keys/blades/hooks? Finding sheaths with other magnets in them that you cannot find in the dark/on a forst floor in deep duff?

Thoughts?

Thanks.