CMV (Converted Meteorological Visibility) definition
CMV (Converted Meteorological Visibility) means a value obtained in such a way that the value of an observed ground visibility (prevailing visibility) is multiplied by a specific factor that depends on the way aviation lights are operated and on whether the pertinent approach is made in the daytime or the nighttime. CMV is applied in the case where RVR cannot be used under the minimum meteorological conditions (landing minima) for the approach procedure and in the case where RVR exceeds the maximum operating value.