We sell them at the outdoor store I help run. One of my part time guys recently bought the Helix 5 SI/GPS. He has not had time to get out with it due to the ice on Truman to give me a report. As with all SI and Di units the bigger the screen the better the clarity. But with that said most anglers can not afford a $2400 1199 Humminbird. So these are a great way for guys to get the benefits of SI on a budget. It is capable of split screens. But while using SI I think you will want to only use that screen to give better details. Same for using the gps/map screen while running the lake on plane.