Jump judges (usually four) who calculate the competitors’ penalties based on the course and the marking system chosen.
course steward
Official in charge of enforcing the rules and of the layout of the course; during the competition, the steward also controls who enters and exits the track.
first aid team
Medical staff who are ready to act in the event of injury to a rider.
double
Obstacle composed of two single components that are very close together; the horse must clear it in a single jump.
oxer
Two-part obstacle composed of movable parallel bars; there are two designs, one of identical heights (square oxer) and one of different heights (jumping oxer).
Obstacle made up of a water-filled ditch with a hedge in front; the horse commits a fault if it touches the water or the lath marking the end of the river.