I have a 76CSx and use City Navigator, USA Topo and Inland Lakes V3 in it.
The maps are pretty much the same as Lowrance maps, with one exception. The contour lines on Chickamauga are odd numbers, such as 7ft, 14ft, etc. It's not something you can't get use to but I would much rather look at the screen and know they are 5ft increments versus having to zoom in to get the depth contour numbers. Most ditches and humps show up well.
Other than that, they are similar to other underwater contour maps I have seen.
By the way, they also do the same with their Topo maps, ie. odd contour lines.
