One boat is designated to serve as the "Rabbit". All other boats stay downwind of the "Rabbit" prior to the start. The "Rabbit" rounds a designated "Starting Mark" (possibly the leeward mark) at or just before the starting signal and starts sailing close-hauled on a port tack.
The starting line is defined on one end by the mark and on the other end by the aft-most point on the "Rabbit". All other boats cross this starting line and once across, have started.
Once all the other boats have started, but no later than 1 minute after the starting signal, the "Rabbit" is free to tack to starboard if the skipper so chooses.
Boats that find themselves to windward and unable to cross behind the "Rabbit" as well as boats that did not start before the "Rabbit" tacks to starboard, will be considered "OCS" (on the course side of the starting line at start) and must round the pin end of the starting line (keeping the mark to port) in order to be counted as a starter. During this maneuver, the OCS vessel must keep clear of all boats who have properly started.
Elapsed time starts counting at the starting signal.