There are a ton of resources for learning more about these pieces of equipment. Youtube, has countless videos, humminbird & crappie.com also have forums totally dedicated to electronics. I've only had mine since this winter and there is one piece of equipment I don't want to go fishing without this is it. Unfortnately your tied to Navonics if you want old hickory and priest. The Lakemaster looks like a better fit for the system but since I fish those two lakes the majority of the time I went with Navonics.
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