The Amateur Trapshooting Association, with headquarters in Vandalia, Ohio, is the governing body of U.S. and Canadian trapshooting. Under its auspices numerous trapshooting competitions, notably the Grand American Handicap, take place each year. Trapshooting competition takes three forms: singles, handicap, and double-target shooting. In all three the targets are hurled from one trap, and 12-gauge shotguns are used. In singles shooting, contestants fire from a series of five stations located 16 yd (14.63 m) behind the trap. At a signal from the contestant, the clay target is hurled forward into the air, away from the firing line. In order to simulate the unpredictable flight patterns of birds taking wing, the targets are sprung out of the trap at various angles and in various directions. The clay pigeons rise to a minimum height of about 10 ft (about 3 m) and, unless hit, fall to the ground about 150 ft (about 45 m) from the trap. Champions often hit 100 out of 100 targets.