IMHO .. then leave it as it is.  Describe the line as an obstruction and do not try to create an no-cross line without calling it what it is .. an obstruction.

Trying to walk some linguistic line doesn't make it better. 

If it were me, I'd make H the start finish mark, make the line between H and the tower an obstruction. 

I guess the reason I don't have a problem leaving it as an obstruction is because in Annapolis the Frostbite Series for decades started at a corner seawall at one side (first pic .. about 100 boats usually ... those barges in the first pic north of Triton Light were not there) ... and every Wed Night we have over 120 boats finish between a long line of piers on both sides (2nd pic). 

We also used to have Frostbite starts from a flag on the seawall as shown below where there were rocks close to the seawall that would nail a J105 depth, but other boats could sail over.  Those rocks were noted in the SI's, but no limits were put on boats.

Yes John, I agree. I meant there may be no reasonable opportunity on some courses and so there seemed to be some suggestion that the protest needed to be raised before the NSC boat crossed the finishing line and I was merely trying to say that couldn't always be possible. 

I have just watched the Women's regatta on mastabeam. Fantastic.

I see the dropbox in the form for "AI Involvement" now and hadn't noticed it earlier.  Thanks for pointing it out!

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.