Hi all I was wondering how good was the Aquapulse PI from the UK? I hear that alot of shipwreck hunters use this machine and get good results, how could it compare to the ones on the market. Surfmaster PI, Sea Hunter and Eric Fosters PI machines? I need something for diving and that goes deep to find the gold rings!! I am not too worried about finding junk for that is the process with looking for gold in the ocean. So what is your take on this machine!! Aloha