To all the "confused" people:
I've been as guilty of this as anyone, but I've been trying to turn a new leaf. Before guessing what the RRS says and typing an opinion here, open the book and read it. When posting here, be sure to include the rule number, it will help everyone. Hint: the RRS is also available (free) online on several sites (USSA, ISAF).
At least in my case, when I don't do this, I have often found myself "misremembering" the RRS, which can lead to some embarrasing statements. Any time you open the rule book, it either teaches you something or reinforces something, both of which will help you tremendously on the water when you have no time to be looking things up.
Paraphrasing, but basically, the default rule of 44.1 is, for any violations of Part 2, two turns. Hit a mark, one turn (yes, there are exceptions, look them up).
PTP is right, SIs can (and often do) change the requirements given in RRS 44.1 and 44.2. Most often for cat regattas, we use one-turn for everything.
Here's the most creative change that I've seen (this was for a big-boat regatta):
"RRS 44.1 and 44.2 are changed so that, except for infringements of Part 2 that occur within the zone of a rounding mark or finishing mark only one turn, including one tack and one gybe, is required."
Hope this helps.
Mike
Thanks, - here is a link
http://www.sailing.org/20348.php