Every sport has its own level of officiating. Baseball has an umpire that calls every pitch; ultimate frisbee is entirely self-policed. Sailing is somewhere inbetween. Competitors are primarlily responsible for enforcing the rules. Race committee and protest committee may protest boats as well (but are generally not obligated to). Even in match racing, where umpires are watching like hawks, the boats have to fly a protest flag for them to call a penalty.

Regards,
Eric