The course covers numerous call mechanics including OUT, SAFE, FAIR and FOUL (PLATE and BASE umpires) to UMPIRE INTERFERENCE, INTERFERENCE, RUNNING LANE INTERFERENCE, OBSTRUCTION, NO CATCH, THAT’S NOTHING, INFIELD FLY, STRIKE, BALL, FOUL TIP, BATTER INTERFERENCE, and many more.

These are shown in game situations to help see the call mechanic clearly, and how to differentiate the mechanic when the play is very close.