Don't know. Never really cared. I only go as fast as my eyes can see the water, which is about 33 mph. I missed a floating picnic table on DL by an inch or two, a floating telephone pole on Sak by about the same distance, and to many tree trunks to count because I saw them with enough time to avoid them. I'll sacrifice the 5 minutes to get to my spot with the boat and myself in one piece.