There are three grades of referees in underwater hockey.
Level 1 - Club Referee:
A Club Referee is able to referee at Club & School tournaments/competitions.
In order to become a Club Referee you must complete a Level 1 Referee Course, pass the exam, and be deemed competent by a National or International Referee.
Level 2 - National Referee
A National Referee is able to referee all the tournaments as a Club Referee and additionally Interzone & Trans Tasman tournaments.
In order to become a National Referee you must complete Level 2 Referee Course, pass the exam, and be deemed competent by an International Referee.
Level 3 - International Referee
An International Referee is a referee who is invited to the World Championships.
Criteria: Ranking is determined by performance at the tournament