I certainly can agree that broadcasting your true length overall while running a light tug and then extending it after pinning up is a logical thing. The rules don’t permit (AFAIK) for that kind of latitude, at least not yet… There isn’t any regulatory provision to allow the “prudent” thing in this case. Yes it’s an aid and a very useful one but restricting us from using it to broadcast our true dimensions makes it less so. I agree that keeping the AIS updated properly should be the mandate, IMHO.