PART 2 , S E C T ION C : WHEN BOATS ME E T — RUL E 18 : MAR K- ROOM 177
Even though I is well behind O, I has an inside overlap when O reaches the zone; therefore O must give I mark-room.
M is in between O and I and overlaps both of them; therefore, I is overlapped with O when O reaches the zone. O and M must keep clear of I and give I mark-room.
them. As they are not sailing below ninety degrees to the true wind, the terms “clear astern,” clear ahead” and overlap do not apply to them, so they are not “overlapped,” and the port-tack boat must keep clear of the starboard-tack boat. See the definition Clear Astern and Clear Ahead; Overlap.
“Are there any limitations on obtaining an overlap and becoming entitled to the rights in rule 18.2(a) or 18.2(b)?”
Yes, there are two:
1) the boat astern cannot obtain an inside overlap and become entitled to mark-roomonce the boat ahead reaches the zone clear ahead of the boat astern (rules 18.2(b) and 18.2(c)); and
2) the outside boat is not required to give mark-room if she has been phys- ically unable to give the inside boat mark-roomfrom the time the overlap began (18.2(f)).
Up to 1965, a boat clear astern could get a legal inside overlap as long as it was (a) in time to enable the outside boat(s) to give room; (b) before the boat ahead changed her course in the act of rounding; and (c) before any part of the boat
