I've have read lot about knowledgeable folks saying the AT Pro doesn't work well in salt water.
Last month I went to Buccaneer State Park and while I was there, I hunted the beaches, with all three of my machines. Dry sand and wet sand only (for a while), the pickens were slim. A few clad and nuts and bolts (beach junk).
I had read so much about the ATP not doing so well in salt water, I wanted to give it a try, so when I came back armed with a scoop and better shoes, I would know if it would work okay, or if I needed a salt water machine.
I made passes in water up to my shins, and spent about 10-15 minutes looking around. I dropped my sensitivity back to 3 bars below max and found no problems, I did get some hits and if I would have had a scoup, I may have been able to retrieve them. I have never hunted with an MD in salt or fresh water before. Maybe I would find the machine would act differently if I went out into deeper water. As it was (I may be wrong) the ATP will probably be my salt water machine, for my 1 or 2 weeks a year at the beach. If not then I'll see what else Wayne has to offer.
Roy