Tim and everyone else...the question is not about whether the prova is a good rule, but whether it must audibly be declared. I like Tim's assessment of the silent competitor...I teach our kids to be proactive and to ask "is that a provisional?" Most often, the competitor looks up with shit in his teeth and says "what's a provisional?" Hopefully it's explained properly and then the comp says "yup, that's what it is."
Tim, grinds my gears as a coach when kids don't mark their provi properly and end up with two of the same brand, same number (since they came out of the same sleeve) and don't know which is in and which is out, which is lost and which is found.
Bill, I go with Tim's second scenario in casual play...you guess the spot of the provo and play four from there. Usually a little shorter but in the fairway.
Jim, how many times do you hear people say "hit another" or "I'll hit another." I guess that your question refers to competitive play, as guys playing casually would ask each other "What the F*$( did you think it was?" My gripe is with people who don't know to hit a provisional at all, then ask "what do I do when they are 250 yards and 2-3 floors away from the elevated tee.