If you have a few minutes you should take a look at this Spanish Matchrace site. http://matchrace.es/index.html
Full of interresting cases, rules, idioms, appeals and some great photo's. I especially like the series on ENGLISH for ... Each month new English words with an explanation, on anything to do with sailing, water sport and maritime life, even swearwords.
They have even taken the effort to let you hear the rules! If you click on a link in that section someone starts reading out loud the Racing Rules of Sailing. Very good for improving your own language skills.