It would be very cool to have a viewer where we could dial in confidence limits. 

For example if it is clearly established from testimony that there was no overlap 15 boat lengths from the mark, do we want to be 50%, 65% or 95% confident that an overlap was established by the 3 BL zone?  Using the COP, 1DRMS, and R95 , and positioning the boats at the outer edge of a probability envelope, we might be able to say “ Even at maximum separation of the data points, we are 95% confident there was an overlap as the boats entered the 3BL based on paired observations with a delta of 0.15 seconds”

If the overlap already existed at 15 boat lengths we might want the discretion to dial down confidence to 66%, 1 DRMS, so that we can say “The parties agree there was an overlap at 15 boat lengths, and there is reasonable doubt (66% confidence level) that the overlap was broken before entering the zone”

But I realize that we risk sounding like the ballistics expert at a murder trial. :) 

Nevertheless, I think viewers like Kevin’s that interpret the data direct from the devices are an important ingredient if we introduce tracking into protest rooms. 

Raceplayer is fun but it was not designed for the protest room 

See discussion above.

Hitting an anchored boat may found a claim for damages, but does not break any IRPCAS rule.

Hitting a dock or pier, the same.

This one is worth answering directly, because you and the app agree and it wasn't letting you see that.

The rule 14 card only ever proposes one move — you hold your course — and asks whether holding it is legal. So on a card where the answer is "that's a foul", the app is saying exactly what you were saying: swift and decisive action was required and holding on wasn't good enough. It just never gave you the words for it, and it never told you that contact was actually coming, which left "surely she'll get out of the way" as a perfectly reasonable read of the picture.

The card now says so in the setup: she is not keeping clear, and you are going to hit her. What's left to judge is the rules question — rule 14's first sentence binds both boats all the time, so the interesting half is the second: a right-of-way boat need not act until it is clear the other one isn't keeping clear. When that stops being true is a real question, and it's the one the card is trying to ask.

Clearly placed there by a trimmer trying to share the guilt! ;0))

Thanks very much John. I appreciate your efforts in replying in so much detail.

Our annual program includes a Pointscore Series (Pursuit format; scratch -> biased towards slower boats) run every fortnight ( 15 races per season), Championship (Yardsticks; 2 races each day; 14 per season) and Sprints (Yardstick, 3-5 races per day; 24 say races per season) => run in turn every other week.  (so C-P-S-P each month).
 
We'll be running our annual October Regatta (6 Divisions) , Hobie States, Spiral Nationals + the International Canoe World Titles this year so we'll be busy, and having lots of fun and enjoyable times out on the Bay!

As Race Secretary I want to apply a common entrant list and a common set of rules for our club races. (KISS).  We are transitioning from a Cox-Sprague system to low-point (Sailres) next season. We have a meeting next week to decide on the rules.

After much research and simulations and yours, and others kind feedback, my preferred approach is DNC= Starters+4. I thinks the committee could settle on DNC = [12] which is starters + 4 for our average fleet size of 8-10. There is a group who want to keep the regatta approach of Entrants + 1.
 
We'll see who 'wins' the debate. Interesting Times (pun intended)! 

Cheers and Thanks again for all the great feedback. 
PS many clubs face similar issues and so it is worth discussing it here.