Latest news just out! Copeton Dam is now fully surveyed.Being able to view dual maps with your Charted Waters maps gives a whole lot more detail. . It's available for your Lowrance or Simrad Yachting compatible sounders from C-map Genesis at Note the difference in surveyed depths, our survey data was gathered many years ago when the lake was low. As with any inland waterway always take note of the depth difference once you hit the water. If it's 7m lower than the contour shows, then deduct 7m every time you look at a spot.