This is a much better way to do it..
“For the benefit of the television satellite time, a race lasts for 45 minutes. Recommendations include having two aquabikes in the centre of the course manned by skilled operators. If a craft breaks down and the yellow flag appears, the aquabike speeds to the stricken craft and tows it to the centre of the circuit”
“Also on either side of the course will be craft with turn buoys aboard. In the event of a turn buoy being hit and punctured, the yellow flags appear and the buoys are replaced swiftly”
More here: http://raceboatinternational.com/index.php?id=765