RedactedNarrative: Victim 1 was seated in the bow area of Vessel 1 as it was cruising.  Vessel 1 struck large wake created by other vessels in the area and impact with wake caused injury to victim 1's back.  Vessel 1 then transported Victim 1 to Sandy Beach to Meet Marshall County Ambulance.  Area of accident was approx .5 mile east of North Island and approx 1 mile south of Sandy Beach and approx 2.5 miles north of the south shoreline.