Hi Guys, I've used the tracker Mark IV for many years now and can tell you allot about it. First off it's in my opinion one of the best detectors on the market for what it's targeted for, that is the newbie. It has a depth in most New England states of about 6 inches on a dime which is more than enough, since most good finds are no deeper and most are around the 3-4 inch depth. The tracker IV also is really accurate at pinpointing your target. So what settings work best for me you ask ? I set the Selector switch to Tone ID, The Sensitivity to as high as possible without getting chatter or false blips, and the Descrimination somewhere between the nine to twelve Oclock position on the dial (I bring and use a test rusty old nail, placed on the ground I'll be searching and desciminate it out but only untill it has a faint scratchy sound ) BTW as to the question about the ten inch coil I have it and yes it can and does get you deeper. But I rarely try to go deeper since like I said most of the good stuff is only at the three to four inch depth. If your not finding wheat cents then, your location is probably already cleaned out or never had older coins to begin with. Good research pays off, you can't find what's not there. If you are finding wheaties then you've got a chance of finding silver.