Daddy flea,
More details with etrac.
Yes you will get falses,,,high tone glint with higher manual sens,,,iron usually causes.
So,,what to do??
The great thing is,,,when the etrac coil is moved over iron,,,tone responding(sound) won't usually be in unison from one pass to the other of coil.
So with multiple passes of same area,,you hear high tone glint coming in same post or extremely near,,,,needs investigating.
You can pivot,,,if tone get better,,,good sign,,,,if it get worse,,,continue to pivot around,,,,,but jut because signal is lost,,,,doesn't mean a good say deep copper or silver is not there.
So go back to where signal was at least heard,,and work from there.
While sweeping,,,open screen watch cursor,,,,a good guide,,,you see it hang and stay at the bottom,,below 29 ferrous area,,,,good chance iron.
You see cursor stay down on sweep,,but see cursor make a momentary jump up on screen ---- good sign of possible nonferrous.
Signal should be provided on pretty much a consistent basis,,,,what this means,,let say 5 passes of coil with what seems like ideal coil position and movement speed,,,,and you only get signal 1 or 2 times,,,not good,,,,but if you get signal 3-5 times,,,,much better odds of nonferrous.
You will have to set your own standards though,,,,they vary for folks.