RedactedNarrative: Operator was operating a rental boat when he entered an area that is known as Cougar Island. The island is surrounded by numerous rock just under the surface. There are 4 rock area buoys marking these hazards. He admitted to going 10 mph when he entered the area. He also said he was inattentive to the rock buoy's. As he passed within 50 feet of two of the buoy's the outdrive hit a rock doing heavy damage.