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How would you propose to achieve guaranteed separation in IMC?
ATC radar fills the bill. What used to be called "Radar control" and now rejoices in the name of "Deconfliction Service".
Well, that's another misconception then! Firstly because large areas of low level OCAS in the UK are not served by any kind of radar service, especially at weekends, and secondly because primary radar alone will not
guarantee separation from some other types of aircraft (gliders, for example).
Actually, it's several more misconceptions, because 'Radar Control' cannot be available OCAS, by definition, and it is conceptually quite different from the Radar Advisory Service that has been renamed Deconfliction Service.