Hey guys, Did you know that Navionics Sonar Charts now extend to over 1000' deep? Check out the images below for an example area. With me being a primarily a freshwater guy, 50-60' is deep water. I had no idea that the Sonar Charts were used in that deep of water. Be sure to keep you chart cards updated. For more areas, or to maybe check the areas you fish check out the WEBAPP at Navionics.com