Your rights survive a broken overlap, but not a tack or zone exit

RULE 

Part 2 - When Boats Meet

Section C - At Marks and Obstructions

Rule 18.2 (c) When a boat is required to give mark-room by rule 18.2(b), she shall continue to do so even if later an overlap is broken or a new overlap begins.  However, if either boat passes head to wind or if the boat entitled to mark-room leaves the zone, rule 18.2(b) ceases to apply.

Buoy room rules do not apply at a starting mark surrounded by navigable water or at its anchor line from the time boats are approaching them to start until they have passed them... 

PURPOSE

Protect the rights of the entitled boat.