Our generous hosts provided us with scanners for the Daytona 500. They are an integral part of NASCAR because of the huge amount of feedback generated between the driver, crew chief and spotters. I'm not sure how much communication actually goes on between the car and the pits in sportscar racing. Scanner rental booths at stock car races are as common as hotdog stands, but I haven't seen any at sportscar races. My view is that the more the sport can involve the fans, the better it will be.
I really cannot understand why the ACO hasn't embraced scanner rental for the 24 Hours (which could also deliver Radio Le Mans) and the very innovative class leader identifier system used in ALMS, whereby the first 3 cars in each class are identified from trackside, by a series of lights in the door panel, which are activated by a start/finish line transponder. It enables those without radios/scanners to stay in touch with an endurance race and would be highly relevant and useful at Le Mans.