Our club now has a permanent buoy that we use as a turning mark, but we used government marks or permanent marks placed by other yacht clubs (with their permission) for many years. We race upwind/downwind courses so our volunteer committee boats (normally sailboats) drop an inflatable mark downwind of the turning mark for the other end of the start line on the night of the race with the boat as the other end. No issues with vandalism or anchors holding and it is a reasonable task for a sailboat on the night of the race. Just my 2 cents. Jim Reinardy C&C 30-2 "Firewater" Milwaukee, WI
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