I've just returned home from Cascade Locks, Oregon (a.k.a. "The Gorge") where I was an umpire for the College Sailing Team Racing National Championship. A very interesting weekend with some great umpires and fantastic sailing. Congrats to Roger Williams for winning the title in their first appearance at the regatta. Going into the last race of the final four, Roger Williams and BC were tied, winner takes all. So much for those who say a round-robin format isn't exciting; here, it worked out just perfectly.
Here is an interesting call I made. The video is from the other umpire in my boat, who was wearing a GoPro. I'll hold off on posting my answer for now. This takes place at the leeward mark with very heavy (~2 knots) upwind current. The orange boat that gybes around is boat 7. The green boat involved is boat 13. There is contact between the two boats and 13 also hits the mark (that's what I'm relaying when I'm speaking into the radio). No damage. Both boats protest and hail for an umpire decision. 13 enters the zone at around 5 seconds into the clip. What should the call be?
Watch more video of ICSA / APS Team Race National Championship 2011 - College Sailing Nationals on sailgroove.org
Also, here is the full video of the last race. Terrific coverage from multiple camera angles (including an onboard camera on the umpire boat.) I make a call at about 4:05 into the video, you'll hear half of the discussion between the umpires and then the flag: