Are you going to use it for record trials ? If not , set a standard NAMBA 5 buoy corner and if your running IMPBA just pull buoys 1-5 6 -10 and you have a three pin corner, the radius would be a little funky, but if its not for records does it matter ? Both online rule books show the standard course sizes and pin placements but if the NAMBA entrance buoys where left in place it would work.