Thanks.....You'll do fine with it. The sensitivity controls are separate for si...di....and 2D. There is a guy named Wayne P. on several of the forums....including the Humminbird side imaging forum. He is a fisherman of some note and did a great write up as to why one should use fish ID. The bottom line is the algorithm for the Humminbirds fish ID is pretty advanced. I keep it on all the time and it works great for me.
Regards