Join Date: Jan 2007
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As far as I know Navionics sell vector charts. There are Navionics ENCs which are presumably the same S57 format charts technically, with some additional objects (primarily marina services and tide stations which are not included in "official" S57 charts).
As far as accuracy or detail - there is a "lot of stuff there" but I did not compare them item by item, obviously so I can't say how far off from reality either type is.