There was a discussion about this a few weeks back ,so I bought 1 found it very helpful . More detail than the regular paper maps on the lakes I looked at . The website did'nt say the lakes around central Ky I fish were on it but they indeed are . As for the 3D ,have'nt looked into that yet an dont know if they are available or not . Upon purchase with mine I get 1 free 3D download an I guess you have to purchase the rest . For $20.00 I beleive it's well worth it.