What kind of beach are you hunting there Grunter?? I don't beach hunt,live nowhere near any beaches. I know guys who do,but they always mention OTHER types of trash,not nails! I can see why they might be there though,being as some boats are wooden....washed up crates...etc.....OK,so...the machine operates no differently in the Quick Mask screen than the Discrimination screen. The difference between the two is that on the Discrimination screen you can FINE TUNE the disc patterns into all those weird shapes and patterns,accepting nickels,discing out this,accepting that....the QM screen is a GROSS adjustment,a big wiper up and down and another side to side. Usually guys will have one or the other completely clear,a clear screen accepts all targets and when sweeping an iffy signal it may be necessary to have NO discrimination so as to be able to hear the "complete picture" of what's around your iffy target. They are two Discrimination screens, and you can toggle back and forth between the two,one is for gross disc,the other for fine disc. When you are operating in one,the other is non functional until you switch back to it.
I don't know how long you've had your machine or been beach hunting but from what I do know,most beach hunters run NO disc. The small gold stuff reads like foil and the big silver stuff reads like HIGH SILVER! The guys I know dig anything conductive on a beach,meaning anything BUT iron. Generally speaking,something WAY lower right is not going to be what you're looking for. It's also where bottle caps live...not the aluminum twist ones. If you're looking for where targets appear on your screen,or VDI numbers,just Google search "etrac VDI chart". That'll get you going with the numbers at least and you can cross check them in the Smartfind screen when you're out hunting.
Best of luck...