A little off topic, but hence, this rule:
(b) A vessel of less than 20 meters in length or a sailing vessel shall not impede the passage of a vessel that can safely navigate only within a narrow channel or fairway.
My rule: "He's working, I'm not. He shouldn't even have to think about me!"
Now...about those rocks.
Right, 30 feet is not a lot. I wonder what the one time cost to blow them apart would be compared to the initial and ongoing cost for bouys would be.
The other alternative would be to wait for a massive disaster and the do something about it?