On the booms there is a sticker that say "stay out of the channel" there is a reason why.... Photo of a ship passing through the shipping channel in Charleston, SC as college sailors compete for the ICSA National Championship.
With Charleston being the 8th busiest port in the United States, sailboats in the Charleston Harbor have to avoid the shipping channel. Photograph from Charleston Race Week as a cargo ship passes a Melges race in the Charleston Harbor on April 23, 2016.
In sailing there is the start of the race but the competition starts five minutes before the race even begins as boats jockey for the best position and wind. This is a photo of a J70 race at Charleston Race Week as boats cross the starting line.