I'm wanting to start fishing new lakes, and finding better places on my current lakes. I want to be able to scout out brush piles with a graph, (a big one) and be able to troll in accordance with it. I've seen what good sized walleye look like on the side imaging down at the bottom along with bait balls and it made me want one. As far as down imaging goes I'm not sure about. Is Hummingbird the only electronic that will sync with I Pilot? I've heard HB is more user friendly is that true? If I get a big Hummingbird is there a class I can take on how to use it or should I grab a fisherman who knows how to tinker with them already and have them show me the best they can? I live 40 minutes from the largest Bass Pro Shops in the world, would they have seminars on how to use them there? I don't want to spend close the 3 large on a graph and not know how to use other than for depth speed and water temp. Should I get my graph from BP or is there somewhere cheaper? Any advice helps. I'm leaning towards the 1198 si and di.