I've been super happy with the Lakemaster Great Lakes V3 card for KY lake, its spot on everywhere I've been on the north end of the lake. You can also do the ChartSelect program if you only want to purchase one lake at a time, for a big lake like KY or Barkley, you might be money ahead to just get the whole card however. You could also download the Navionics app on your tablet or phone and take that out with you, then you have the best of both worlds...