Are their any different settings you use for fresh water searching? I use discrimination at 1. volume at 3/4. sensitivity at 11 [should this be on auto]. The one lake I have been going to has lots of iron. It is not giving a tone but the threshhold shuts off, and returns when I lift the coil. Just wanted to know if anyone has any good advice on freshwater searching. My fist time using the Excalibur was in a freshwater lake and I found a mercury dime. Now I would like to find some gold. I do dig everything.