I've got a place I've dug quite a few silver coins and 11 gold rings. Not much bigger than a double car garage. I used pinpoint on my Excal II a few weeks ago and got some more silver and an old ring. I want to put the GT on the area and the area is small enough to dig everything metal. More gold and silver will come forth I'm sure of that. So the question is how to set the GT to all metal. Might be just flip the switch but I'm wanting to make sure.