Basically, I took all of my coordinates from my Lowrance 520 units and put them on his HDS. It was only a pain because I had never messed with an HDS. Now that I have it would take me about 30 seconds to complete. I can assist you if you would like. I live in the Owasso area and if your close, I would be willing to come by and help you or you could bring your boat by my house and I could help. Also, I'll be at the lake alot this weekend, we could meet up if you like. It's really isn't that bad if you know how. You can go to the corps website via the link above, save the coordinates to your computer, load them on an SD card, and then put them on your Unit.