It further states: “non-co-operative surveillance is required wherever an ATSU providing surveillance-based air traffic services identifies that it is probable for non-transponder equipped aircraft, whether identified or not, to present a hazard to operations due to the uncertainty of their positions” Although, the text currently within CAP670 inhibits the provision of an ATC service based solely on non-cooperative surveillance, under the Civil Aviation Authority (Air Navigation Directions) 2017, as amended (the Air Navigation Directions), the Secretary of State has given the CAA the function to prepare and maintain a co-ordinated...