Hello,
I've used the nmamm modes a couple times now with mixed results. I have found non-ferrous metal but it's deep scraps of aluminum and barbed wire. As with most things metal detecting if it (coins, buttons etc.) ain't there it just ain't there. The nmamm modes do seem to require constant monitoring if you plan on using them. I think it might be best to use the modes as a backup to the motion modes if a questionable signal is discovered. I am still going to use them though. I live in the southeast United States.
I've used the nmamm modes a couple times now with mixed results. I have found non-ferrous metal but it's deep scraps of aluminum and barbed wire. As with most things metal detecting if it (coins, buttons etc.) ain't there it just ain't there. The nmamm modes do seem to require constant monitoring if you plan on using them. I think it might be best to use the modes as a backup to the motion modes if a questionable signal is discovered. I am still going to use them though. I live in the southeast United States.