Umpires' area
It is hoped you will as always be able to ask an Umpire for clarification of any rules issues about which you are unsure.
Calls' downloads:
Rule 17 - On the same tack, proper course; RRC 2009/2
Rule 18 - Mark room; RRC 2009/1, RRC 2009/3, RRC 2009/4 and RRC 2009/5; ISAF Q&A 2009017, 022, 024 and 025
Rule 19 - Room to pass an obstruction ISAF Q&A 2009021 and 024
2011 Event call: Rule 18 at a finish
The main authority is, of course, ISAF: The basic rule book (with highlighted changes) , the team racing call book and Q&As (these are Q&As on all the rules, not just those directly related to team racing).