I have never had Lowrance but I have never got pics like this or Like Dave puts on his Humminbird threads. I guess I don't know what in the heck I'm doing. I do have the 2nd best Humminbirds in Helix 10 and Helix 9. Like the others said fish spot one.
Bring your boat to Fork and schedule a trip with Slade Dougherty. He'll have those Humminbird's tuned in no time, plus give you tips on settings and operation. Might even catch a few fish.