Thanks for the info jimbuna, that's the gizmo I was thinking might exist.
I guess there's still a lot of undiscovered war graves in the area of former USSR, and also elsewhere in the world, Far-East etc. A lot of unsolved fates 'on a neverending patrol'.
edit. Now that I think about it the Mythbusters were using something similar in order to find Jimmy Hoffa's body from a baseball field. No luck for them.
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