Just got me a Navionics Platinum card. Just looking at it here at the house, I think I'm really going to like it.
I primarily fish KY lake and my Lowrance didn't show contour lines. This card has very good detail. It has several other features such as Satilite over view photos and 3D imaging of the lake bottom contours.
I can't wait to get on the water and give it a test run.