Ed, make sure you try a few tests with targets in the ground at 5 or 6 inches. set the sens to auto at 24 and see how well it sees target, then lift coil till it disappears, if you do not get any signal switch to manual and try again at various levels and determine which setting gets you best depth. I would run iron mask at -9 to start in conductive mode if enough non ferrous trash around, or even lower the iron mask farther to around -2 to -4 and run in ferrous audio just looking for tones above the low iron tones, if only trash is iron...good luck