Pirates Cove Marine Park - DeCourcy Island, BC Anchored here and also in Herring Bay on Ruxton Island. In Herring Bay a nearby boat dragged onto us. We had to reanchor & then go out in 30 kt. wind in our 8' rowing dinghy to tie off his boat to a mooring buoy to keep it off the rocks. Dummy had 50' of anchor rode out in 35' of water and couldn't figure out why he dragged. The wind rose to 35 kts. overnight and our anchor held - 35 lb. plow anchor with 120' 5/16 chain plus 50' 5.8 nylon rope.