My friend Lani rightly pointed out that calm weather is better for learning the currents, since they're not hiding behind wind-driven waves. Here's a screen shot from webapp.navionics.com. I just discovered that the little blue and white button in the bottom left corner shows more contour line intervals.
This is the area I'm sailing in. I expect that the yellow area is never submerged, and the green area is what you see at the lowest tides.
This is where Ramana and I sailed for an hour or so, staying in one place, wind and current in equal opposition (little red boat):
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