Perhaps good for bottle diggers (who try to find disturbed underground outhouse pits, trash dumps, etc...). But, assuming you're looking for large metal items (caches), then why not just get a 2-box detector ? Like the TM 808. For a microwave oven sized object, it will reach that 3 to 5 ft. deep with ease. For a jar sized object, you could get 3 ft. with ease, etc..... And they naturally reject (don't see) anything smaller than a soda can sized object. Hence the perfect machine for big-game hunting.