Like, course numbers and stickers? Get the newest stickers, out this year, or copy someone's onto your boom (or a piece of duct tape) with Sharpie pen. A is always the most windward mark; B is a reaching mark which may be at the windward or leeward end of the course, on the left as you face A mark from the start line, and C is always at the leeward end of course. Match the number displayed by the race comittee to the course sticker, and don't forget to count laps as you go around the course!