I have emailed them and demanded that they send me a 1XG or 2XG gold chart 2010 card for the missing lakes. Lake Michigan is a pretty big lake to miss. They referenced the Navionics GOLD charts link for the lakes that were build into the NVB unit. The 1XG or 2XG GOLD charts are the only charts available on that link. In either one of those you get the US portion of the Great Lakes. They do detail out the local fishing lakes listing (N,S,E,W), They should have done that for the Great Lakes. I feel like they are doing a slide of hand trick. I would have purchased the regular unit and a GOLD chart card separate. Other than that I think the unit is great. I will pursue this.