This is basically what the official F1 iPad app is like, which I happened to have with me at the Australian Grand Prix last year. It made a pretty big difference to actually know when various drivers were about to come past, and what was happening in the other parts of the track.

As things got more tense toward the end of the race other spectators were crowding around for an overview which our eyes couldn't possibly provide, considering our vantage point. It was definitely one of those "holy shit I'm living in the future" kind of moments.