Pretty silver coin!
This issue, besides finding is very interesting.
I try to bring the swing recommend 3 feet per second, in clean areas, meadows and beaches with low amount of trash.
Normally operated Zero PRO mode and iron disc. zero. When I have a call, consult the VDI and change the speed of the swing. I can also switch to Custom Coins, iron disc. 40 until the target center if there is trash around. If the target is too deep too fast swing helps locate, I think ... When the area is used by many people holidays, pilgrimages and fairs, with a lot of garbage, many aluminum rings and plugs, then my swing is slow, as if levitating coil, checking and consulting VDI numbers, avoiding all under 60, you can dig a thousand more aluminum rings.
You may not understand but the important thing is to work with the machine and use all possibilities offered little by little we know better.
best regards