Hello,
You can eventually look for "nautical charts symbols", it will show you that the pale green zone is an intertidal area.
Sometimes wet, sometimes dry if it doesn't rain. Sky blue areas representing land is not usual.
Regards,
Luc
Hmm no, when I look at the chart, all sized up and zoomed in, I see a white dot that looks like a shallow area, then like a thin deeper river or path and a small piece of island or rock formation just slightly northeast of it.
No symbol that would in anyway refer the area to a sandbar or shoal.
Anyway, it does not correspond to a real chart, I mean do your chart look like this ?
If they do I would be quite astonished, it would for me look like there's either wrong with my eyes or the chart.
Just look a the Google Earth satellite images, green are land mass and light blue etc are sandbars, either it's tidal water or not.