IF the ref has a watch that beeps, why would we need so many cameras on the goal line?
Why would they turn off hawkeye for a penalty?
They wouldn't turn it off - but they'd have no need to refer to it if the ball made the onion bag bulge, surely?
It doesn't work on a referral system, the watch Buzzes when the ball goes in. If the watch doesn't buzz it's not a goal or at the very least the referee stops the game to find out why his watch is broken.
I hope it vibrates enough that he notices; my phone vibrates in my pocket and I barely feel it. If the ref is running, he might not feel it go off. I recommend replacing the vibrating mechanism with a small but sharp needle that jabs them in the wrist when a goal goes in.
Why not make it an electric shock instead of a vibrating/buzz?