Gen 2 is the new ones. The chirp is a better version of sonar that can be used to get clearer images. None of those are what you want. You want a di version. I would also suggest that you get one that has N in the name so that you can network it. Adds to the resale value. I know the autochart live function is great and we have talked about it before. That is an extra chip to save that stuff. My advice would be to get the smallest gen 2 that has di and 2 chip slots that can network.
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