Apparently the chart comes from Understanding the Racing Rules of Sailing by Dave Perry and illustrated by Brad Dellenbaugh.
I am not surprised - the chart is excellent and these fellows are top RRS gurus.
So, I hope these gentlemen will not object to the post.
If you are at all interested in the RRS, you should buy their book and subscribe to the excellent Speed and Smarts newsletter which is published by Dave Dellenbaugh and illustrated by Brad Dellenbaugh, who is also, by the way, the Sailing Director for the New York Yacht Club, a former Olympic Soling campaigner and was recently the chief umpire at the America's Cup in Valencia. Definitely worth checking out the Speed and Smarts website and Facebook page.
Dave Perry also gives great tips and advice on the US Sailing website.