Just have to agree with what you found James. I learned what I needed and used the GPS version before deciding to purchase a LCX 15CI last year. It is also good for a refresher once in a while when a question comes up. 
Are these things like a tutorial? That would be a good service since, I’ve never really figured out what a “rock” bottom looks like compared to a soft bottom. Is that something they’ll show you on these things? 
Yes they seem to be. Works just like the one in the boat. In fact depending on what you have you can download your very own unit. You can see how things change when you change the grayline setting , then the sensitivy, Take your time and just play with it and you will be suprised . Make sure you down the one you have or are going to get. Have fun and if you need help you know where to ask any question. HERE. Someone will help maybe even me if I can. Jim
Thanks James. My unit is an Eagle, but surprisingly it works just like a Lowrance, just came in a different box with a different nameplate. 
Eagle or Lowrance — almost the same–Hope they have the one you need. Have fun– Jim
Lowrance and Eagle are the same company.
Yes I know. Jim
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