Moorings Geographe Bay

Does anyone have any idea what's the go with the moorings down in Geographe Bay... more specifically east/north of Abbey boat ramp. I was down that way over Xmas and noted lots of holidayers boats moored up. Down there couple of weeks ago and all free. I would usually end up in old dunsborough with the kids over Easter but if I'm further that way the place we stay doesn't have enough room for boat on trailer.

cheers