PART 2 , S E C T ION C : WHEN BOATS ME E T — RUL E 18 : MAR K- ROOM 193
Before reaching the zone, S has right of way over P under rule 10. However, the moment P reaches the zone clear ahead of S, rule 18.2(b) requires S to give P mark-room.
as possible (see the definition Proper Course). Note, however, that the moment an inside/right-of-way boat gybes to round
the mark and becomes an inside/keep-clear boat, she is only entitled to mark- room, which is the space she needs to sail “to” the mark. It does not include roomto sail her proper course; and if she takes more space than she is entitled to, she will not be exonerated by rule 43.1(b) (Exoneration) if she breaks rule 11 (On the Same Tack, Overlapped).
WH E N T H E B O AT S A R E N O T O V E R L A P P E D
“Okay, I’ve got it so far; now how about when the boats are not overlapped when they get to the zone?”
The second sentence in rule 18.2(b) covers the situation where the boats are not overlappedwhen the boat clear ahead reaches the zone. It says, “If a boat
