Will I be able to hear the scanner at the track?
Does it play the race radio?
They are head phones so you should be able to hear. I have never heard anyone say they could not hear them. They should have MRN or PRN besides the various driver frequencies available.
There are also fanscan units available that are like TV coverage of the race available for rent. More expensive but just depends on what you prefer. Best to look at them when you get there.