The most accurate maps are the ones you make your self with lowrance's insight genesis or humminbird's autochart. The commercially available maps are all about the same, but from my research, navioincs sonar chart seems to be the best because it gets updates from all of the folks that record their own data and share it with navioincs.
If you want help making your own maps, shoot me a pm.
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Wishin' I was Fishin'
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