This is a simple and cheaper to install variation of the TRAP discipline, where only one trap is used and target variation is obtained by the continuous oscillation at the trap in both horizontal and vertical directions in order to give the same speed of targets as in Olympic Trap. Similarly the targets are also thrown to a maximum of 80 metres. A variation is that the shooting station could be less 15 metres away from the trap.
Information is courtesy of www.cpsa.co.uk.