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.