The freshest info is what is currently entering the screen. Everything past the edge is "old" info. You are looking at what is directly below the transducer as you pass over. The signal is cone shaped (narrow at the top, wide at the bottom) and the dimension at the widest, bottom, varies based on depth.
Thanks gents just wasn’t sure what was going on when I took it on the maiden run it looked like Chernobyl under me NOTHING...p.s to the slayer of all fish I fish to stay sane till the elk get to noisy until then I bug you hahahahaha