Wrong form-factor, wrong application
On the touchline, what do electronics give you that a whiteboard does not - apart from cost and unreliability?
Backup solution is an extra pen and a paper towel. With planning, you have a play book, which everyone has memorised and the coach may have printed out.
As in smartphone maps, proper planning means they aren't really required. IT is often used when people don't know stuff.
IT is not the solution to everything.