Apparently the Sunsail boat was at Cooper and somehow became un-moored while crew was ashore. They reported the boat stolen and stayed the night ashore. It drifted to Deadman's bay and grounded. Got this from Moorings staff.
Maybe its just me but I am constantly looking over at my boat while on land...maybe more than I checked on the kids when they were little. Surprising at Cooper where there isn't far to go. I guess i could set a remote anchor watch but not that paranoid (yet).
