Vessel 1 was traveling at a speed greater than slow no wake approximately between 10-20mph when he looked behind to check for boat traffic in the area.  When operator 1 turned around he saw and was very close to vessel 2 who was operating at a speed of slow no wake.  Operator 1 let off the throttle and attempted to turn sharply right.  Vessel 1's bow struck vessel 2 along its port side.  Vessel 1 rode up the bow of vessel 2 damaging the hull of vessel 1.  Both operators were ejected into the water and suffered injuries to the head.
Lake Geneva