This is GPR . What are you hoping to accomplish ? Are you looking to cache hunt ? (as opposed to individual coins and relics). If you're looking to cache hunt, why not just get a 2-box machine ? Because the only thing that looking at blotchy images of pixels will tell you is that : There's a large object down there. No different than the "beep" of a 2-box will tell you. You are NOT going to get a magical TV image of a treasure chest or whatever.