We all seem to need more lessons in sonar and time on the water is not enough unless you are a pro. using it everyday. I personally learned from an Eagle Mach 1 Paper Graph and after many hours it was like swiming underwater. Most average fishing people cannot afford the best units like myself, i use a Eagle Mark 320. Priced right and has great features. But for learning i wish someone out there in the BOC could tell me where to purchase a dvd video of on the water footage of locating structure, fish, baitfish, dropoffs, humps, points, of areas that hold catfish and crappie also. I have looked over the internet and at Bass Pro Shops and Cabela's and cannot come up with one. If anyone knows of one please send me a Private message or post it here! I think this would be a great idea for one of our videos on the BOC. I have a new Mini Cam DVD Corder but haven't had it on the water yet. Maybe i will try this and send it in, but you more profesional cat fishermen and Ladies might help.