Welcome and good question, as I have asked the same in the past and some of the guides that post here can answer this question on use your depth finder... I however will not say much about it, because it is all I can do to fine tune mine...
I know the sensitivity can be adjusted to see your jig and when I got my answer the reply was that he could see the jig and the fish come up and hit it. Now that is sensitive... Ain't figured that one out yet, but several of these guys can tell you how...
But welcome and I'll B C'n Ya... Happy Fish'n
This only my opinion, but nothing you can say will change my mind. That makes it a FACT.
Today is a Blessed Day and a Prosperous Day