For all those among you who want to have the feel of real boats on the water, while learning the new rules I suggest you have a look at:
Uncle Al's Rules in Pictures!
In his long sailing career in the Wayfarer Class, Uncle Al has collected untold number of pictures to illustrating every rule in the book. He has just finished updating "Racing Rules in Pictures" for the 2009-2012 RRS.
In the photo above on the left, 1305 (starboard) is an obstruction to 1131 who is on port tack. Therefore 1131 would have had the right to hail 171 for "room to tack", had he done so well before the moment captured here. Having not hailed, 1131 is now blissfully sailing into a situation where he is sure to foul the starboard boat (1305) since he's left it too late to bear away, or he will foul the boat to windward of him (171) by doing a crash tack (see photo on right) to avoid 1305.
This material is intended as a practical guide of the basic Rules necessities for his fellow Wayfarers, but just the same, he hopes that a few of LTW's readers might enjoy looking it over and sending him (firstname.lastname@example.org) word of any errors they may find. He has done his best to proof-read but the extra eyes would be welcome.
I suggest you have a look, it is worth it!