https://www.espn.com/college-football/story/_/id/11121315/florida-state-seminoles-coach-jimbo-fisher-use-gps-technology-win-national-championship
here is an article about Jimbo using it in 2014.
Checks MPH's, work load, distance traveled, "Explosive plays"...the place it really helps cutting down of soft muscle tissue injuries. You are able to monitor if you are working someone too hard during a season.