So at a gate, with a 3-BL circle around each buoy, it's quite possible the two zones will overlap each other. Couple that with not knowing which gate a particular boat is ultimately going to round...and I think I'll need an Advil!

I wonder if anyone considered a time-based zone definition...something like "within 15 seconds of the mark". This way boats of all different speeds, lengths have the similar times to make rounding preparations.