Ok, I'm trying to learn this machine. I've gone out to an old homesite ( 112 years old) , and I've been to an old ghost town founded in 1900. I've tried hunting a couple different ways. I've tried 0 disc, and pick up so many iron sounds, that it gets frustrating when that's mostly what I hear, and have a difficult time trying to find a target that gets a good repeatable high tone or mid tone in both directions. So I tried hunting in disc 1, and the iron sound pretty much goes away, but I've noticed every time I get a meter reading of a solid nickle, it's been a square pulltab? I haven't tried hunting in the salt mode yet. I have my sensitivity set at 4, or 5. Enhanced mode is all I've been using so far. Any suggestions?