• 18.1(a)(2)
  8 Comments
  Nicolas Ch. Today 13:02
• How long is the race committee allowed to change the position of the first windward mark?
  41 Comments
  Christian Hartmann Wed 19:30
• WIND Rewards Winner for October
  0 Comments
  Paul Zupan Wed 17:42
• TOP TEN CASES
  24 Comments
  Catalan Benaros 25-Oct-30 18:55
• From Course Side?
  31 Comments
  John D. Farris 25-Oct-21 18:59

• 18.1(a)(2)
  Nicolas, the difference between 18.1(a)(1) and 18.1(a)(2) is subtle but important, and it comes down to covering different kinds of opposite-tack encounters near marks, especially when wind shifts shake things up.
  
  Rule 18.1(a)(1) is for classic windward beat situations: It says Rule 18 doesn't apply when boats are on opposite tacks and both are on a beat to windward. That's pretty straightforward; it's the typical situation when two boats are converging on the windward mark from opposite sides, both sailing upwind. This rule exists to avoid chaos in the zone when boats might try to claim mark-room even while still beating and tacking.
  
  Rule 18.1(a)(2)  The "Weird Shift Clause" (as Dave Perry calls it). This rule applies when only one boat needs to tack to sail her proper course at the mark. It's not limited to boats beating to windward; it covers situations caused by wind shifts, current, or overstanding. Here's one example:
  
  Facts:
  Assuming the fleet was initially sailing upwind toward the windward mark on a beat to windward. 

  1. A significant wind shift of approximately 60° to the right occurred during the leg.
  2. Boats that had been approaching the mark on the old starboard layline were now reaching toward the mark, no longer sailing upwind or on a beat to windward.
  3. A boat on port tack (P), approaching from the left side of the course, remained on a beat to windward toward the mark.
  4. Boat P and a starboard-tack boat (S) converged at the windward mark while inside the zone.
  5. To round the mark, P had to tack, whereas S did not.
     
     

  Conclusions:
  1. Rule 18.1(a)(1) does not apply because neither boat was on a beat to windward.
  2. Rule 18.1(a)(2) applies because only one boat (P) needed to tack to sail her proper course at the mark.
  3. Rule 18 does not apply between P and S.
  4. Boat P is not entitled to mark-room and must keep clear of S under Rule 10 (Opposite Tacks).
  
  In short:
  1. 18.1(a)(1): Both boats beating = Rule 18 OFF
  2. 18.1(a)(2): One boat has to tack, the other doesn't = Rule 18 OFF
  
  

  
  
  
  
  John D. Farris Today 14:29
• How long is the race committee allowed to change the position of the first windward mark?
  Niko. Thats what we did.  we've started the process of rearranging the course early before the warning signal and the pin end finished moving before the prep signal, but for some reason the first mark (boat) was somehow slow doing it and did not manage moving to the new position in time. Realizing that i've showed AP and restarted the whole thing.  All the questions, if this had been in the rules or not raised up later after racing and some competitors kept complaining even to the next day. so i tried to do my homeworks the next day. very interesting readings.
  Christian Hartmann Yesterday 05:22
• TOP TEN CASES
  FWIW, as I read RRS 32.2, the "S" flag replaces the blue flag referred to in Race Signals.
  John Mooney Thu 16:05
• NOR adherence to SAS requirements
  The OSR are not listed as rules in RRS Definitions Rule and are not designated by WS as a rule (listed in RRS 6).  They do not automatically apply.  They need to be switched on in NOR 1 with words like 
  
  1.2  The World Sailing Offshore Special Regulations applicable to Category X races apply.
  
  Where X is to number of the Category selected by the OA.
  John Allan 25-Oct-31 02:01
• Rule 18.3
  Ang thanks I see your scenario does mention Yellow forcing Cyan down below the mark. Agree 11 is broken in that scenario. Thanks for digging up the 2018 reference to 18.3 not ending until the two boats leave the zone. That was an interesting learning. 
  Warren Collier 25-Oct-30 12:41

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