This is the standard milling pattern used by the Australian Model Power Boat Association.
During the two minutes and 30 seconds prior to the start of the race all competitors must use this milling pattern. 
When your boat is launched, you must make one COMPLETE lap of the course before you can take an alternate route through the middle
During the last five seconds of the countdown to start, you cannot cut the course short - you must go all of the way around unless you have already started the turn before the 10 second indicator.  In other words: if you are on the front straight and the countdown has reached 10seconds until the start - you must complete the full course - no short milling patterns allowed
Boats on the back straight have the right of way over boats merging from a short mill pattern - if you cause another boat to have to avoid you when you merge onto the back straight you will be given a lap penalty - or disqualified if you cause the other boat to stop.
Any questions regarding this milling pattern should be brought to the attention of the contest director on the day of the race.  The Contest Director is the final authority.

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