I am basically a coin/jewelery hunter--however I will be visiting the Outer Banks in January and would like to also hunt for iron spikes, nails...etc from shipwrecks. My feeling was to open the screen ( I use an e-trac) and go for it and dig everything. The beach area that I will be hunting is not a high traffic area for tourists so minimal junk should be encountered ( at least that is what I am hoping ). Is this the right approach? I will be using a 15x12 SEF coil.