Thanks for the reply. That is a bummer for me for sure. It sounds like even if I buy the PC program, I will still have to remap the lakes I want then? The lady at Humminbird lead me to believe that I could take my existing maps and load them on to a disk with the Software and then my 597 would be capable of seeing them. No biggie either way. I still needed to have the zero Lines card for my helix nine unit anyway. I may just sell my 597 and make my nine A portable unit for winter time. Might even have to get another nine or 12 for the front of the boat. Do you run auto chart yourself? If so, I might have to talk you into getting together with me and showing me a few tricks on it. What part of Wyoming are you located in? I am in Byron. Take care , Joe