1. when the first of two boats reaches the zone,
   2. If the boats are not overlapped, the boat that has not reached the zone at that moment shall give the other boat mark-room. WS Case 2 WS Case 12 WS Case 15 WS Case 25 WS Case 59 WS Case 63 WS Case 75 WS Case 81 WS Case 95 WS Case 114 WS Case 118
   When a boat is required to give mark-room by this rule, she shall continue to do so for as long as this rule applies, even if later an overlap is broken or a new overlap begins.