I think I have decided I am gone order me a humminbird helix 9 for my new to me boat. I was wondering if anybody has one of these helix units and if you need the lake map navionics chip to go along with it. On the navionics it doesn't say the specifically have the maps to fit a helix but I am assuming that it is not listed because the helix is a newer unit. Under the specifications of the depth finder it just says preloaded contour maps. If anyone has any answers to this please let me know.