Please read Carig Murray's last post:
As you may notice there are several interesting points here. No one can say certainly that the British sailors were not in Iranian waters given the present information. This is a complicated technical issue. I think today developments and Mr. Larijani's suggestion to form a panel investigating the matter is indeed good news. It also could be a first step toward determining Iran-Iraq maritime borders in Northern Persian Gulf, a step that would eliminate a potential source of conflict between two neighboring countries and prevent such incidents from happening in future.