There are two field umpires, each controlling roughly a third of the field and cooperating on the rest. Most tournaments and some normal matches will also have a reserve umpire who is in charge of any off-field officiating.
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2 on the pitch who make decisions based on the game and implement the rules of hockey. At the top top level, they can be assisted by numerous individuals (including Technical Directors etc) who will help with timing, implementing penalties etc.