Rosalie B. wrote in
:

So what do you think this is?



As it's "behind the boat", I'd like to closely check the cutlass bearing.
They can make some horrible noises if something gets inside them or they
are wearing out. Their sounds radiate through the hull up the back of the
boat and I've heard their chatter sound like someone coming up behind the
boat before.

Worth having the diver take a look. Your hull needs scrubbing anyways I
can see from way over here....(c;