So as per your illustration I should be seeing some fish arches. Especially on a school of fish. We both know that they are not all pointed or swimming in the same direction so some of them should cross my cone angle correctly to create arches. My boat idles at about 3.3 MPH,no arches,when I kick it in neutral and it slows down to drift speed I get arches. I don't even get partial arches due to a unlevel transducer. All I get is round blobs. Something is wrong,I have been running Lowrance products for over 15 years. I'm running Gen3 units now with the latest updates installed.