I have the Hook2 5" with Navionics. The only way I have been able to get the Sonarchart Live to work and actually map the contour of a lake was if I had the Navionics card in AND charts set to Navionics. Any other chart besides that, and the Sonarchart Live option disappears and I can't map contours. It is not very user friendly. I mapped a small lake last week, and to be honest, I don't know if it actually saved what I mapped. I'll find out next time I am out there.