AT Pro stinks in salt water, it is really a land machine you can use in the rain and creeks, ponds, etc. Some say they do all right on wet sand beaches but most don't, and immersed in salt water they don't do well. They will work but no depth. If you're gonna go into salt water get the Sea Hunter or Infinium, or a Whites Dual field, of course the Minelab Excaliber rules the salt because it has good depth and can really discriminate, but they are pricey. I think the Sea Hunter probably gives the most bang for the buck in the briny.