Just had an unusual thing happen. I was way ahead of a following boat rounded top mark and gybed onto port. Also a second boat did the same after I gybed to cover the immediately following boat and it was much further behind. there was no wind shadow indicated as the wind shadow option was activated. But in seconds they were both 50 plus metres ahead. It really seemed that there was some sort of cheating going on. Or was there some strange bug in the programme? Anyone else experienced this? I have noticed that very occasionally my boat slows down even tthough there is no wind speed change even when the vmg mode is activated.Puzzling?