RedactedNarrative: On 11/30/2019, at approximately 1500 hours CST, vessel 1 (V1) was being operated by the owner in St. Andrews Bay, Bay County, FL. on the bay side of Shell Island.  Operator was trying to anchor V1 by attempting to back it up to the shoreline to participate in recreational activities.  As Operator was backing V1, water started coming over the stern and began swamping the vessel.  Operator stated the vessel quickly became overwhelmed with the water coming in and it started listing and overturned (capsized.)  Operator stated that he and his occupants were not injured as a result of the vessel capsizing.  Operator made arrangements with Tow Boat US to have the vessel removed from it's capsized location and tow it in.