How important is a fish finder?

[jonrhett]

As you already know, I don't know a whole lot about fish finders, but I'm really interested in the Humminbird 383c.

I've been trying to read online about fish finders, but would appreciate it if someone could take a look at the specs of this unit.

Here is the link to the manufacturers website.

http://store.humminbird.com/sonar-gps-co...010-1.html

Thanks in comments so far guys, I'm already liking the atmosphere of this forum. []
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