Hi, thanks for taking a look! The rocks spawn along the shorelines. If they aren't there on first pass, come back in a bit and maybe they'll be there. The do have a bit of a low spawn rate. I would bump it up a bit if we could.
Yep they'll give a hint. It also looks like they only show up when the tide goes out a bit. This one seemed to de-spawn when the tide came in, but it came back when the tide was low.