Today was no exception, On this site I've been given
the heads up on several places to avoid, like Death rock.
Now I get to add another to the list.

a few hundred yards south west of Black rock there is a
limestone toe just under water that put quite the notch in my
skeg. It was about 1 foot under water 2 hours after low tide.

N30.03.916"
W84.07.372"
Many of you may know of this, but it was news to me.