Silvereagle
It depends on the circumstances... but generally speaking if I am using the 4" coil in the park, I like to go with the all metal mode and then switch to discriminate all metal mode to determine if the target is trash or not. You can do this with the standard coil too but the signals will overlap in a trashy area, and that can be confusing sometimes, better to hold it higher off the ground to get each target individually when that happens. If she wants to be more selective she can scan in all metal and then switch to auto notch, which will discriminate most unwanted items out, but because of ground mineralization and metal characteristics, you can miss an occasional good target that way. The easiest way is just to hunt in autonotch because it will yield the best results with the least hassle. If she does that remind her to swing slower to give the detector time to recover from the targets it is blocking out and register the good targets. Also over lap each swing of the coil by half because in the discriminate modes, only the inner coil is active. I only hunt with the large coil in fields or woods where there is little trash because although it is possible to use it in trashy areas, it does take alot of practice to keep the blood pressure down to a minmum. Hope this helps my friend.
capt.