Nothing to do with MY setup - it's merely a function of the input data, which is wholely supplied by governmental agencies - not the private sector. To MY knowledge, there is no private sector surveying of the world's waterways being conducted - it's just cost prohibitive. Consequently, everyone using GPS, computer based charts, and paper charts, are by and large relying on information generated by USGS over the past century.
Granted, some of this is up to date, so to speak, early 2000 data, but there's an enormous amount of information that is older than many of the forum members. John, if you have the opportunity to traverse the ICW in South Carolina, Georgia, etc..., you will quickly discover what many travelers of this waterway have. Charts, regardless of where they're generated from, are by and large, quite inaccurate. It's not the fault of the electronic gear, it's the input data.
I understand what you're saying, and yes - I have had the opportunity to traverse the ICW thru SC, GA, etc... More than once, as a matter of fact (grin)...
I would disagree with you, in that in general, I find most of the charting to be incredibly accurate... Shoaling inlets are the obvious exception, of course, and anywhere else where the tidal ranges are larger, and the current runs strong... On Sunday morning, entering Port Royal Sound from outside from the north, I cut the corner by about 4 miles inside the sea buoy, shooting the narrow gap between the extensive shoals to the north of the very long entrance channel... As usual, I was astonished how accurate the charting of such a dynamic area remains, it was right on the money...
But again, I have to wonder what sort of e-charts or programming you're using, because in my experience, I've never seen any of them that have placed me on dry land anywhere along the ICW or its inlets (with the possible exception of a small, extremely changeable one such as Carolina Beach, perhaps) My C-Map for the waters inside Barnegat, for example, are slightly off - but anyone relying solely on e-charts in such a place, at such a scale, is really asking for trouble, anyway...
As gotd 25 suggests, that's when it's time to Look Out the Freakin' Window... (grin)