RedactedNarrative: OPERATOR 1 WAS OPERATING VESSEL 1 WHILE PLOWING WHEN PASSENGER 1 STOOD UP WHILE THE VESSEL 1 WAS UNDERWAY. AS PASSENGER 1 STOOD UP VESSEL 1 STRUCK LARGE WAVES, CAUSING THE PASSENGER TO LOSE THEIR BALANCE AND IMPACT THEIR SEAT. THE IMPACT WITH PASSENGER 1'S SEAT CAUSED THE PASSENGER TO SUSTAIN INJURIES. NONE OF THE OTHER OCCUPANTS ON VESSEL 1 SUSTAINED ANY INJURIES AND THERE WAS NO DAMAGE TO VESSEL 1.