I have a Garmin Echomap 53CV unit. I absolutely love it. The unit is easy to use and the sonar is clear as a bell. The Homeport software makes it easy to do pre-fishing for likely spots on any lakes without being there. It is an awesome feature. Just plug in the file for the maps (download from Garmin website) and do your review of the lake and select some spots and set some waypoints. When you actually get on the lake it will help you get there if you need to have it Show you the way.
Very good clarity on all the structure.