I got one free with the purchase of my navionics chart. For my old crapmarine (opps raymarine). It wasn't worth the free cost. Not much more than a a regular chip has, and when I put it in it did not have nav aids, so I had to switch back and forth. A real PIA.
With my garmin G2 there is a fishing chart built in to the nav chart, one click of a button to switch, but even with it, it does not have much more than regular chip. More bathy lines is about it.
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