Forum: Rule 18 and Room at the Mark
2025 RRS 18.3 Tacking in the zone
P
John AllanCertifications:
- National Judge
- Regional Race Officer
1
RRS 18.3 Tacking in the zone
Here’s the 2025 rule
18.3 Tacking in the Zone
If a boat passes head to wind from port to starboard tack in the zone of a mark to be left to port, rule 18.2 does not apply between her and another boat on starboard tack that is fetching the mark. If the other boat has been on starboard tack since entering the zone, the boat that passed head to wind
(a) shall not cause the other boat to sail above close-hauled to avoid contact, and
(b) shall give mark-room if the other boat becomes overlapped inside her.
RRS 18.3 has been somewhat re-arranged, but there is no change in the most common case where another boat has tacked onto starboard outside the zone and is fetching the mark.
The test of ‘fetching the mark’ is now no longer applied to the tacking boat, but is applied to the other boat. This makes little difference: it was always to be presumed that if the tacking boat was fetching the mark, the other boat would also be fetching the mark.
EDIT: Putting the test of fetching the mark on the other boat closes off the opportunity for a tacking boat that has caused the other boat to sail above close hauled to just be miraculously unable to make the mark, so not 'fetching the mark', and not breaking 2021 RRS 18.3.
EDIT: Putting the test of fetching the mark on the other boat closes off the opportunity for a tacking boat that has caused the other boat to sail above close hauled to just be miraculously unable to make the mark, so not 'fetching the mark', and not breaking 2021 RRS 18.3.
The rule is now to be applied in two steps:
1. Whether the other boat is on starboard tack and fetching the mark, in which case RRS 18.2 does not apply, and
2. Whether the other boat has been fetching the mark since entering the zone, in which case the tacking boat is required to:
(a) not cause her to sail above close hauled to avoid contact, or
(b) if overlapped outside her, to give her mark-room.
What has changed as a result of this two step application is the situation where two boats tack in the zone. Where two boats both in the zone on port tack, needing to tack to round the mark to port, when either of them tacks onto starboard, and the other boat then tacks onto starboard and is fetching the mark, RRS 18.2 will not apply, but because the second boat has not been on starboard tack since entering the zone, the obligations in RRS 18.3(a) and (b) will not apply, so no boat is entitled to mark-room and only the right of way and room to keep clear rules apply.
Comments
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Does 18.3 apply between boats Green (just crossing HTW) and Magenta (already on starboard but not yet close-hauled) in the image below? I'd argue yes, Magenta is on starboard and fetching. She did tack inside the zone, so the second half does not apply.
Assuming 18.3 applies, then 18.2 doesn't, so what happens if Magenta becomes overlapped inside? She is leeward, but owes room and opportunity (RRS 15 & 16), and is not entitled to room???
You are a boat on port and you just passed head to wind ... if there is any other boat on starboard fetching the mark (inside or outside of the zone when you pass HTW), 18.2 does not apply between you.
I have to admit, when I first read this my mind played a trick on me when thinking about 2 boats on port tacking in the zone and passing HTW exactly at the same time, but that singularity doesn't create an issue (after a gentle offline head-slap by an experienced judge knocked me back to my senses) . In all cases .. if the windward tacks first, leeward first or simultaneously, there is always a boat on stb when the other passes HTW.
Prior to passing HTW, the windward boat was entitled to MR, but MR no longer includes "room to tack". Normally such a boat would necessary sail past the mark to the stb layline. The question will remain to be answered whether or not windward's MR will include room for her stern to swing as she turns to HTW on the stb layline, after sailing past the mark .. as part of her room to "sail to the mark".
Acknowledging that windward's windward course "to the mark" requires a tack .. and the first component of that tack is sailing up to HTW .. I can see the argument that it does (and thus the old MR language about "room to tack" is unnecessary).
Putting the test of fetching the mark on the other boat closes off the opportunity for a tacking boat that has caused the other boat to sail above close hauled to just be miraculously unable to make the mark, so not 'fetching the mark', and not breaking 2021 RRS 18.3.
OR
IF other boat tacks 18.2a OFF and 18.1A(1) ON All of rule 18 is OFF. SAME RESULT Rule 10 ON.
3 Other boat tacks in the zone 18.1A(1) OFF = Rule 18 is back on as 18.2(C) ON.
I fail to understand what your saying.
18.3 is never ON so how can "therefore 18.3 applies and 18.2 does not"?
18.3 Tacking in the Zone
"If a boat passes head to wind from port to starboard tack in the zone
of a mark to be left to port, rule 18.2 does not apply between her and
another boat on starboard tack that is fetching the mark. If the other
boat has been on starboard tack since entering the zone, the boat that
passed head to wind"
Agreed
It will initially be RRS 13, but no matter.
Do not agree.
18.3 Tacking in the Zone
"If a boat passes head to wind from port to starboard tack in the zone
of a mark to be left to port, rule 18.2 does not apply between her and
another boat on starboard tack that is fetching the mark. If the other
boat has been on starboard tack since entering the zone, the boat that
passed head to wind"
The second boat has passed head to wind from port to starboard tack in the zone of a mark to be left to port
That's the applicability condition of RRS 18.3, stated in the first clause of the rule, bolded above.
Therefore: rule 18.2 does not apply to her and another boat on starboard tack (that is the first boat that tacked) that is fetching the mark. This assumes that the boat that first tacked is indeed fetching. If not, then you are right, RRS 18.3 won't apply and RRS 18.2(c) will.
Only if the first boat to tack is not fetching the mark.
No, there are alternatives:
How i am reading the 18.3 there are 2 conditions that must be True for 18.3 to be on thus turn off 18.2.
18.3 Tacking in the Zone
"If a boat passes head to wind from port to starboard tack in the zone
of a mark to be left to port, rule 18.2 does not apply between her and
another boat on starboard tack that is fetching the mark. If the other
boat has been on starboard tack since entering the zone, the boat that
passed head to wind"
As the both boats enter the zone on port the second condition was always False thus 18.3 IS OFF rule 18.2 ON.
Your thoughts thanks
There are THREE conditions in RRS 18.3
As I said in my OP
Conditions 1 and 2 are the conditions that switch on RRS 18.3 and switch off RRS 18.2
If Conditions 1 and 2 apply and Condition 3 also applies then the obligations of RRS 18.3(a) and (b) apply, otherwise they do not.
Q1: Can anyone confirm that a boat just past head-to-wind (not yet close-hauled and still subject to rule 13) is considered "on starboard tack" for the purposes of this rule?
Seems like it would be, but I want to be sure before I teach it to 200+ other racers.
Tack, Starboard or Port A boat is on the tack, starboard or port, corresponding to her windward side.
Q2: I added info to the diagram... lemme know if I should make a separate thread for this.
My understanding is that:
The Definition Leeward and Windward A boat’s leeward side is the side that is or, when she is head to wind, was away from the wind.
is also relevant.
A boat is ALWAYS on either port or starboard tack.
But Magenta has other tactical options besides gybing away:
But, "the other boat" must be on starboard and in the zone in order to turn on 18.3 if either (a) or (b) apply?
What if "the other boat" is on starboard in the zone but she was but is no longer "fetching the mark"? What then?
Y initially fetching the mark on starboard.
B slam dunks Y, and keeps clear and from @4, Y cannot hold her lane and falls below the layline, cannot pinch up in the dirty air, and is no longer fetching.
Good Question.
@2.5 B passes head to wind from port to starboard in the zone and Y is fetching the mark: RRS does not apply between B and Y (RRS 18.3 first sentence.)
@ 3-delta Y, on starboard tack reaches the zone: the obligations of RRS 18.3(a) and (b) will apply to B (RRS 18.3 second sentence), but Y is not yet overlapped inside B so B is not yet required to give Y mark-room.
@3.5 Y becomes overlapped inside B so B is required to give Y mark-room, to sail to the mark. If, at this point, Y had luffed up, but not above her course to the mark, and closed the gap, Y would be required to respond, both to keep clear (RRS 13 then 11) and to give mark-room (RRS 18.3(b)), but Y doesn't luff up, but begins to fall away to leeward in B's dirty air. No rule broken.
@4 Y is no longer fetching the mark. The conditions of RRS 18.3 first sentence no longer apply, therefore RRS 18.3 no longer operates to disapply RRS 18.2, boats are overlapped in the zone, RRS 18.2 applies.
Boats were not overlapped when the first of them (B) reached the zone, so RRS 18.2(a)(2) applies and the boat that has not reached the zone (Y) is required to give B mark-room.
Because she is in dirty air and is separating to leeward from B, Y is giving B mark-room. No rule broken.
Any advance on that?
Also, I was thinking originally more about a scenario where "another boat" was fetching the mark outside the zone but had to change course thru no action of the port tack boat (wind shift) like this:
Fetching
In your latest diagram B appear to be fetching the mark throughout. Unless you're saying there was something big quick lift between @4 and @5.
If the tacking boat is in the zone, and the other boat is not, but is fetching on starboard, then RRS 18.3 first sentence switches off RRS 18.2, but RRS 18.3 second sentence an (a) and (b) are not yet engaged, nor do they need to be because with one boat inside and the other outside they are very unlikely to be close enough together for (a) or (b) to actually operate.