Do they have to make use of a flash system to alert the deaf players when the ref. blows the whistle?
Easy enough to tell when the whistle’s been blown.
I have not see that - of the players none are totally deaf either - range from 20% to 70%. All have hearing aids and the team has a translator on the field and at every practice but they never flash signs on the field I have noticed just if the coach wants to talk to them on the sideline do they get involved.