So have an 898 HD DI GPS model on the front of the boat with the trolling model (I think that is the right model, it is close to that if I am off a number or so). I have been wanted to put the a SI version the console reading from the back of the boat. And in the meantime, it looks like the 8something series has been discontinued - though it might still be available at some places it is going quick from what I can tell. What they have now is the Helix models in a variety of series (the 5, 7, and 9 is what I am seeing) that offers 3 or 4 models in each one. I am good with that if that is the way to go, but what I am curious about is the connectivity. I know if I had gotten two of the 800's I could network them (I know that requires some additional stuff) so that way points put on one would show on the other. Anyone know if you can do that a Helix model and the 800's series?