I was hunting in the woods today in an area littered with deep iron. the CTX was telling me that all the iron was at about 10 inches or more.. My sensitivity using auto +3 dropped down between 14-19. I tried using ferrous coin separation but it seemed useless because the iron was so deep. The ferrous coin setting was giving me a permanent 12-40 12-38 hovering in that area pretty much every time i used this setting. I switched over to try the ground coin separation, in combined audio, enabled Ground balance and did a noise cancel. WOW what a difference it made. It completely silenced the deep iron but was still able to pull up targets that reached down to about 6-7 inches above all the deep iron. even with the sensitivity under 20. Not much to speak of in a way of finds but i managed to pull up some clad and a 1907 beat up indian head penny. Don't know if i was using the right settings but it handled pretty good. HH