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You could put a submerisble pump on your belt with some flexible hose. You'd need to cut the hose and wire it into a cannister or other battery. The pump is expecting 5v so you may need to put a buck converter in the can - although you could probably get away with running those things at 12v since it'll be plenty cool in the ocean.LOL, lots of great ideas...perhaps I should be a little more specific in my question, though...
Any of you folks currently using something other than your hand to fan the silt away while metal detecting, and if so what is it, why do you like it and what have you tried that is not much better than your hand?