Geof, members will want to know how far from the Port boats were you when you finished your gybe and reached close hauled STB?  PS a drawing would be helpful. 

A diagram would be very helpful here.

Do either of these diagrams represent the scenario?

 

Dear Geof ,
To me it looks like which ever way i see it , you had the ROW (10 Initially) and Mark Room (18 later) . I find this video (link below ) very helpful. Hope it settles .

https://www.youtube.com/watch?v=ZITlXzJG57Y&fbclid=IwAR3xgKtoraIpS-cBZOuHgnkuUJqAgYy5ymyvUFGtWOzE26LWIQgoFI4GLqw 

Once on stbd. close haul, rule 10 - you are a right of way boat subject to rule 15. You do not have Mark Room as rule 18 is turned off - see 18.1(b)

Hi All 
Here is my rather crude diagram, which matches the more professional one provided by Mark...

I was some distance ahead of red and yellow, before missing the mark.
I had completed the gybe before we arrived at the Port / STBD conflict.

Geof, so closer to Mark’s Blue/Yellow scenario?

Angelo, yes. I entered the zone well ahead of the red boat. As I gybed red entered the zone

Port, it seems, is not required to respond to starboard until she is on Starboard; thus the opportunity for collision that is starboard's fault is high.  For safety sake there should probably be e rule that for starboard roundings, any boat that tacks or jibes within the three boat length's of the mark becomes the burdened boat?

Seems to me that once she completes her tack onto stbd Blue is ROW, subject to 15 & 16.1.

If Blue tacks back onto port into a leeward  or clear ahead position (without breaking 13) she's then ROW and entitled to mark room. If Blue crosses and tacks to windward she's got no rights and must give mark room to inside boats. 

Tim, the boat ahead in the zone gybes, not tacks. 

Assuming the following diagram to be accurate. Means answer is still correct.
1. When you gybe onto starboard between position 3 & 4 you become the starboard R-o-W under r10(b), and initially required to give the other boat room to keep clear under 15.

2. When luff to close hauled between 4 and 6 you a right-of-way boat changing course and need to give blue and red room to keep clear under 16.1(b).
3. At position 5, when you hail from mark room, rule 18 does not apply, see 18.1(b)

The following cases are worth reading 9 and 11 

Assuming the following diagram to be accurate. Means answer is still correct.
1. When you gybe onto starboard between position 3 & 4 you become the starboard R-o-W under rule 10, and initially required to give the other boat room to keep clear under rule 15.

2. When luff to close hauled between 4 and 6 you a right-of-way boat changing course and need to give blue and red room to keep clear under rule 16.1.
3. At position 5, when you hail from mark room, rule 18 does not apply, see rule 18.1(b)

The following cases are worth reading case 9 and case 11 

Angel, I'm talking about after the jibe. Yellow (in Mark's diagram) must tack back onto port to round the mark. If she can do that to leeward or clear ahead without breaking 13 she regains rights. 

Not that it matters much, but I am not sure RRS 15 ever applies, I think it may be all RRS 16.1.  Yellow starts out as clear ahead and is that way through most of the turn down, Blue is always astern of the line perpendicular to the stern of Yellow.  For a very brief moment just before Yellow gybes the boats are overlapped (neither meets the definition for clear ahead/astern) and each is on the leeward side of the other and believing they are the ROW boat.  Then Yellow gybes onto starboard and is clearly ROW.  RRS 18 turns off when Yellow gybes and after that it is simply RRS 10 & 16.1 until Yellow crosses HTW.

Means Davis

said Created: Yesterday 18:59

Why is close hauled relevant?

@Mark Townsend, do you use any special software to create your diagrams?
My rather lack lustre attempt was done in paint!

Geoff, I use the open source software here

Boat Scenario

I use the open source software Boat Scenario.
http://boats.sf.net