Or make it simple. Do it like rugby. They show the best angles on the big screens which jas every single stadium in PL. Fans see it. Ref ses it. He gets clue in his ear What they think they see and he is watching as they comment along.

Why the hell would you send him across the pitch to look at shitty little display. The current system is just pathetic excuse that allows them to be shit and then have a piece of paper that states they tried.