pinpointing

A noob question from a noob. When using pinpointing mode with the Equinox stock coil, is there a sweet spot? For a shallow target I can easily find it with a pinpointer or a coin probe. But not for deep targets. I try to do the sweep, move 90 degrees, sweep again technique, but either I am...

When I try pinpointing with the nel thunder I really cannot get it down much more than the width of the coil by going from east to west and north and south. The best way for me is just to use the front tipoff the coil and listen to where the signal appears and disappears and walk around the...