I’ve been a mark boat where the PRO used Bouyzone, and it’s fantastic. No more directing the mark boats over the radio. The PRO defines the course on his iPad, and each mark boat immediately gets a notification and visual guideline of where to set the mark. Just follow the arrow until the distance drops below 10ft and set the mark. Wind shift 10 degrees, the PRO enters a 10 degree shirt, and all the mark boats get a notification to move. Shorten course, same deal.