There are no mooring balls in the area in front of Coco Maya. There is room for a couple of catamarans in the area that you are referring to, but it is anchor only. The approach to the anchorage is unmarked, shallow, and redlined by most (if not all) charter companies. Most likely, the vessels you saw in there were crewed.

Your options will be Virgin Gorda Yacht Harbor, or Leverick (in the North Sound) where you will need to rent a car (or take a taxi).