Repels them...like some sort of electric eel force field, makes you invisible, they think you are another shark or stingray geezling around for shrimp.....also, on the same vein, detectors repel lightening too...on account of the negative air ions getting displaced by the magnetic field of the coil...sheesh! Tesla wrote about this even! Heard of the Tesla coil? Google up!
I've never once heard of a detectorist getting his calf muscle sucked off by a bullshark like a Buffalo Wild Wing, or knocked out of his Buster Browns by lightening either! So we are cool!...
You got a whole lot more to worry about than sharks or lightening! Like Wives! They are the number one killer of detectorists! Good thing if you are not married yet though, you will have a long and happy career! For some reason, like a shark or lightening, girls are not attracted to us at all! We are masked and not a target! Tesla was a bachelor if that tells you anything...
Mud