Go here and get the dvd that applies to your situation. He has different levels for example beginner and advanced on different units.
You can talk to him on the phone and he will recomend the proper dvd.
http://doctorsonar.com
Mention you heard about it on fishin.com. That might help me sell him some advertising in the future. I bought one and it was very helpful. No fluff but lots of info.
It put my friend to sleep but he was pretty worn out at the time.
He even goes to the extreme to set up side by side underwater camera and sonar so he can verify what the sonar is displaying. I doubt anybody at lowrance has done that.



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