三包服务范围和期限以和相关协议所配套的约定为准

A. It is a navigation mode that ensure the aircraft follows a desired flight path in the range of navigation signal coverage. or within the capacity limits of the airborne navigation equipment, or a combination of both.
B. It is required NAV performance.
C. It Regulates the system performance requirements of the aircraft flying in the designated airspace or along the ATS route. flight instrumentation procedure