An EMA must collect the information necessary to monitor horizontal plane navigational performance as part of risk assessments. It must institute procedures to monitor core navigational performance and to continuously collect information descriptive of large deviations and operational errors in the horizontal plane.

An EMA must enlist the cooperation of States and air navigation service providers (ANSPs) in monitoring horizontal-plane core navigational performance through the use of secondary surveillance radar or other appropriate surveillance systems. States and ANSPs have the responsibility to cooperate with the