Responsibility for zoning is frequently vested in the national department responsible for the control of civil aviation. To give effect to this a zoning map is prepared for the guidance of the responsible local authority. The zoning map is a composite relating all zoning criteria to the ground level around the airport. It covers not only the Annex 14 obstacle limitation surfaces but also the radar and ILS zoning criteria, etc. and any local zoning ordinances which may be applicable.