And that's what I meant when I mentioned the difference between a Raster Chart (paper mostly, some electronic) and Vector charts (mostly electronic). As you see on the paper chart the channel is reasonably obvious. Oh and I'm guessing your Navionics is set to feet?
img Selsey001.pdf- (1.06 MiB) Downloaded 824 times
Vector charts were the problem for the Volvo yacht when it hit a reef a few years ago. All crew survived. Now these guys have sailed thousands of miles and their navigational skills are celestial in comparison to, for example a Yachtmaster, except that on this night the navigator was pre occupied with a boat flying along at silly speeds and thought he had checked the charts properly and in fact he had. The reef wasn't on the charts, or was it. Had he had the time to check the Raster charts, or in fact zoom right in as far as possible, there it was, quite a big reef which should have shown itself on a simple zoom. What it boiled down to in the end was at what point did the reef show up on his chart and who decides at which point or zoom does it show, that appears to be the software providers. I'm not sure what the outcome of the investigation was but if I remember rightly the navigator was not blamed.
