I was digging in the horrid Virginia red dirt the last two days with the Deus. Place has been POUNDED by any type of machine possible since he 1960's. I had two suggested "Virginia red dirt" programs set into the machine. Both programs did not work. These is so much ground clutter and hot rocks, every time you would even think of putting the machine near the ground, it would sound off, and sound off and sound off. So I decided to try something else. I switched to the standard Deus Fast program and cranked up the frequency to 78.8 hkz. That straightend out the problem with it the machine going bonkers. I wandered over to a suspected trashy area, with all the leaves on the ground I simply scraped down less than 1/2" to see the red dirt. This one spot had a lot of old trash decomposed on it, so it was not quite so "red". Pulled out tons of ration can pats, three eagle buttons, and eagle button back, Block I, a musket ball, several dozen pieces of camp lead, a percussion cap, a couple real cool iron items, etc.
Deepest object was about 5" but that is not bad in that Virginia dirt. This particular spot had "debris" going down about 6", then it was back to undisturbed red clay dirt.
Now My Tesoro Vaquero will go deeper, up to 8-10" on a minie ball in the same area, and it will work ok in a campsite.
If you are in an open once plowed field, you really need a PI machine for that. In good dirt, the Deus does go very deep.