As I understand it... they don't use a fixed starting line

The fleet gathers above the fixed start/finish line.
On the time signal the rabbit... a pre selected 505. will start leeward of the fleet on port going up wind at max speed.
A power boat will follow on his transom. keeping other 505's off his butt.

The 505 fleet will start on starbord AFTER the rabbit has passed them.

They feel that it gives you the fairest and cleanest start relative to our fixed line starts.

I am still trying to figure out how.. you would get a high speed start with boats around you.... having to time the rabbit etc etc.