Back to Jakes conundrum... is there any obligation of the leeward boat stating their intention (such as "UP") until they actually acquire rights?
No. There is no obligation to hail (it's usually a good idea, but no rule requires it). It is the act of changing course that matters. In fact, a leeward boat can yell "head up" all she wants but if she does not change course herself, windward is under no obligation to maneuver.
Regards,
Eric
